Why Does SO2 And Water Make H2SO3 And NOT H2SO4? (2023)

Chemistry High School


Answer 1

SO₂ is a polar molecule and dissolves in water to form H₂SO₃; however, it does not have the ability to break the H-O bond in water and isolate an Oxygen atom to form H₂SO₄. This is why in the production of Sulfuric acid via the contact process, SO₂ is converted into SO₃ first.

Answer 2

SO2+H2O = H2SO3

To get H2SO4,
SO2 must be oxidizedto form SO3, Sulfurtri-oxide
2SO2+ O2= 2SO3 SO3 can the dissolve in water to form acid rain:

SO3 + H2O = H2SO4

Related Questions

Which substance in Table 5.2 requires the smallest amount of energy to increase the temperature of 51.5g of that substance by 10K ? All of these are specific heats of some substances at 298 K.
So N2(g) is 1.04 J/g-k
Al (s) .90 J/g-k
Fe (s) .45 J/g-k
Hg (l) .14J/g-k
H2O (l) 4.18 J/g-k
CH4 (g) 2.20 J/g-k
CO2 (g) .84 J/g-k
CaCO3 (s) .82 J/g-k


Because we are considering the same amount of each substance and the temperature change is also the same, we can directly compare the specific heat capacities of the substances. The lower the heat capacity, the easier it is to raise the temperature of the substance.
As seen from the table, Mercury (Hg) has the lowest heat capacity; requiring only 0.14 Joules per g per kelvin. The energy needed for the given amount and temperature change:
0.14 x 51.5 x 10
= 72.1 Joules

Which of these has the most covalent character?


Bef2is the compound that has the most covalent character. Whichever element has the greatest electronegativity has the least difference and most covalent character.

C.) BeF2 has most covalent character as the difference between electronegativity is minimum in it as compared to others

Which of the following transitions (in a hydrogen atom) represent emission of the longest wavelength photon? a)n = 1 to n = 2
b)n = 3 to n = 1
c)n = 3 to n = 4
d)n = 4 to n = 2
e)n = 5 to n = 4


For a photon to be emitted, the electron must travel from a higher quantum level to a lower one. Therefore, options A and C are eliminated.
The energy of a photon is given by Planck's equation:
E = hc/λ; whereλ is the wavelength
As seen from the equation, a larger wavelength is observed when smaller energy transitions occur (since energy and wavelength are inversely proportional)
The smallest transition occurs in option E, 5 to 4. Therefore, the answer is E.


E) n = 5 to n = 4


Since the question stated that it is an emission process, options involving increase in transitions are to be ignored. This means option a and b are to be ignored as they refer to absorption.

We are left with three options.

The second option can be dropped because of the huge energy gap involved. Any drop into level one is in the ultraviolet, which are short wavelengths.

We are left with two options now.

(Video) How to Balance SO2 + H2O = H2SO3 (Sulfur dioxide + Water)

The fouth is a transition between two levels, ehich means extra energy involved.

The fifth is a transition between just one level, which means lesser energy is involed.

Energy and wavelength are inversely proportional to each other, so the higher the energy, the lesser the wavelenth.

The emission with the longest wavelength (or, least energy) is the last option, the 5 to 4 transition.

Which of the following has zero dipole moment?

a. NH3
b. NO2
c. PF5
d. HCN


C. PF5has a zero dipole moment because it doesn't have a lone pair of electrons.

Which of the following correctly describes a reaction that forms a disaccharide from two monosaccharides? Answer
Galactose + glucose → lactose
Glucose + sucrose → fructose
Glycogen + fructose → maltose
Maltose + lactose → cellulose


The answer that correctly describes a reaction that forms a disaccharide from two monosaccharides isGalactose + glucose = lactose.
Cellulose is not a disaccharide, glycogen is not a monosaccharide, and sucrose isn't either.

Which of the following best describes the motion of the particles in a piece of steel? None are moving
A few are moving
All are moving
Most are moving

Most solids_____
are dense and difficult to compress
are able to flow
are amorphous
have a disorderly structure

Cyrstals are classified into how many different crystal systems?


The first answer is:None are moving , because particules dont move unless there exists electric current passage on the steel.

Most solids are dense and difficult to compress (obvious answer)

Cyrstals are classified into how many different crystal systems? the answer is 7, (According to Bravais)


C - All are moving


A - are dense and difficult to compress


D - 7

When a mixture of limestone and clay is heated in a rotary kiln, cement is produced. Burning a mixture of methane and air heats the kiln. Carbon dioxide is one of the main gases give two reasons why. and give a reason why sulphur dioxide has a high percentage coming out of the kiln?

(Video) Sulfurous acid (H2SO3) demonstration


Carbon dioxide is a primary effluent gas because it is being generated in large amounts by:
1) The burning of methane which produces water vapor and carbon dioxide
2) The decomposition of limestone, CaCO₃ to CO₂ and CaO
Sulfur is contained within the clay and the high temperature and combustion conditions cause it to form Sulfur dioxide which exits the kiln.

What kinds of intermolecular attractive forces (dipole-dipole, London, hydrogen bonding) are present in the following substances? HF


London forces also known as "induced-dipole-induced-dipole interactions" and are in principle found in every molecule. The interaction occurs from the transient dipoles all molecules have as a result of fluctuations in the instantaneous positions of electrons.
Dipole-dipole arises when we are able to set up a polarity in the molecule. So for an example if a highly electro-negative atom is bond to a less electro-negative atom then there will be a polarity in the molecule and we therefore have the dipole-dipole interaction.
For the determination of geometry for the specific examples , use the VSEPR (Valence Shell Electron Pair Repulsion) model and by that determine the geometry.

What is the role of NaCl and EDTA in DNA isolation?


The following is the role of NaCl and EDTA in DNA isolation, hope it helps:

NaCl provides Na+ ions that will block negative charge from phosphates on DNA. Negatively charged phosphates on DNA cause molecules to repel each other. The Na+ ions will form an ionic bond with the negatively charged phosphates on the DNA, neutralizing the negative charges and allowing the DNA molecules to come together.

What is the oxidation number of Cl in chlorate ion ClO3-?


Oxidation number of Cl in chlorate ion ClO3- is +5

What is the name of the compound Al2(SO3)3?


Aluminium Sulfite is the name of compound.
Al stands for Aluminium.
SO3 stands for Sulfite.

What is the Na+ concentration in each of the following solutions: (A) 3.65 M Sodium Sulfate=
(B) 1.38 M Sodium Carbonate=
(C) 0.785 M Sodium Bicarbonate=

((B)) What is the concentration of a lithium carbonate solution that is 0.695 M in Li+?


Sodium Sulfate = Na2(SO4) meaning there are two ions of Na+ in one mole of Sodium Sulfate the M stands for Molarity, defined as Molarity = (moles of solute)/(Liters of solution), So if the Na2SO4 solution is 3.65M that means one Liter of has 3.65 moles of Na2SO4, the stoichiometry of Na2SO4 shows that there would be two Na+ ions in solution for every one Na2SO4.

(Video) Type of Reaction for SO2 + H2O = H2SO3

Therefore if 3.65 moles of Na2SO4 was to dissolve, it would produce 7.3 moles of Na+, and since this is still a theoretical solution, we can assume 1 L of solution.

Finally we find [Na+] = 2*3.65 = 7.3M

Use the same logic for parts b and c

What is the maximum number of electrons that can be contained in the first, second, third, and fourth energy levels, respectively?


It can be determined by 2n^2 formula
where "n" is the no of shell:
1st shell = 2n^2 = 2(1)^2= 2*1 = 2 electrons
2nd shell = 2n^2 = 2(2)^2 = 2*4 = 8 electrons
3rd shell = 2n^2 = 2(3)^2= 2*9 = 18 electrons
4th shell = 2n^2 = 2(4)^2= 2*16 = 32 electrons.

What is the ionic charge for C, Si, Ge, Sn and Pb?


An atom of carbon has 4 electrons in its outermost shell, which means that
its ionic charge is 4+ or 4-
Si is in same group as carbon so its also 4+ or 4-
Germanium is 4+.
Sn is also 2+ or 4+
Pb is usually +2

What is the ground state electron configuration for Cr2+ , Cu2+ and Co3+?


Electron configuration of:
Cr = 1s2 2s2 2p6 3s2 3p6 3d5 4s1
Cr2+ = 1s2 2s2 2p6 3s2 3p6 3d4

Cu = 1s2 2s2 2p6 3s2 3p6 3d10 4s1
Cu2+ = 1s2 2s2 2p6 3s2 3p6 3d9

Co = 1s2 2s2 2p6 3s2 3p6 3d7 4s2
Co3+ = 1s2 2s2 2p6 3s2 3p6 3d6

s can max contain 2 electrons.
p can max contain 6 electrons.
d can max contain 10 electrons.
f can max contain 14 electrons.

What is the electron configuration of neptunium?


This is the electron configuration of neptunium:
Rn 5f4 6d1 7s2
or, if you want to complicate:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1
Since there are 93 electrons, they make up 5f4 altogether.

What happens in the artificial transmutation of an element? Include an example.


What happens in the artificial transmutation is that the nucleous is bombarded with high energy particles which we can describe as kinetic energy and the idea for them is to induce what we call transmutation. Also what happens is that the high energy particles are accelerated. One of the examples is when nitrogen is transformed into hydrogen by combining its nucleous with an alpha particle

What determines if an element is a solid or liquid at room temperature?


We have to determine the boiling point and freeezing point for it at room tempreature:
IN SOLID: boiling and freezing point is above room tempreature.
IN LIQUID: boiling point is above room tempreature and freezing point is below room tempreature.
IN GAS: boiling and freezing point is below room tempreature.

(Video) How to Balance H2SO3 = H2O + SO2

To a sample of water at 23.4oC in a constant pressure calorimeter of negligible heat capacity is added a 12.1 g piece of aluminium whose temperature is 81.7oC. If the final temperature of water is 24.9 oC, calculate the mass of the water in the calorimeter. Ans:98.6g -I know that The specific heat of aluminum is 0.900 J/g ‡ ÁC
- _T Al is 24.9ÁC _ 81.7ÁC = _56.8ÁC
- _Twater and _Tcalorimeter are both 24.9ÁC _ 23.4ÁC = 1.5ÁC.
-The specific heat of water is 4.184 J/g ‡ ÁC.
But I tried using m=q/s_t. I'm really stuck,can anyone help me?


We know that the thermal energy lost by the hot piece of aluminum will be gained by the water. Another thing we know is that the final temperature of water is achieved at thermal equilibrium, this means that this final temperature is also that of the piece of aluminum within the water.
Energy lost by aluminum:
q = mcΔt
= 12.1 x 0.9 x (81.7 - 24.9)
= 618.552 Joules
Equating this to the energy gained by water:
618.552 = m x 4.184 x (24.9 - 23.4)
m = 98.553
=98.6 grams

Answer: 98.6 grams


As we know that,



q = heat absorbed or released

= mass of aluminium = 12.1 g

= mass of water = ?

= final temperature =

= temperature of aluminium =

= temperature of water =

= specific heat of aluminium =

= specific heat of water=

Now put all the given values in equation (1), we get

Therefore, the mass of the water in the calorimeter is 98.6 grams

The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the Cesium atom. Calculate the wavelength of this radiation (to 3 sig figs). In which region of the electromagnetic spectrum is the wavelength found?


For waves:
speed = frequency x wavelength
speed = 3 x 10⁸
frequency = 9192631770 Hz
wavelength = 3 x 10⁸ / (9192631770)
wavelength = 0.033 meters
This wavelength lies in the region of microwaves.

Answer : The wavelength of this radiation is, and in microwave region, the electromagnetic spectrum the wavelength is found.

Explanation : Given,

Frequency of radiation =

Formula used :


= frequency of radiation

= wavelength of radiation

c = speed of light =

Now put all the given values in the above formula, we get:

(Video) Is SO2 acidic, basic, or neutral (in water)?

Thus, the wavelength of this radiation is, and in microwave region, the electromagnetic spectrum the wavelength is found.


What happens when SO2 reacts with water? ›

Sulfur dioxide reacts with water ( H 2 O ) to produce Sulfurous acid ( H 2 SO 3 ) .

What happens when sulphur dioxide reacts with water to give Sulphuric acid? ›

Sulphuric acid is produced when sulphur dioxide reacts with oxygen and water in the presence of a catalyst according to the reaction: 2SO2(g)+O2(g)+2H2O(l)⟶2H2SO4.

Does SO2 react with H2SO4? ›

The energy barriers for the three hydrolysis reactions are in the order SO2 + (H2SO4)-H2O > SO2 + (H2SO4)2-H2O > SO2 + H2SO4-H2O. Furthermore, sulfurous acid is more strongly bonded to the hydrated sulfuric acid (or dimer) clusters than the corresponding reactant (monohydrated SO2).

Can SO2 react with water to form acidic solutions? ›

As the non-metal oxides are acidic in nature, sulphur dioxide is also acidic in nature. When it combines with water (or dissolves in water) it will produce an acid which we will see in the solution through the chemical equation which is involved during the reaction between them.

What acid is formed when SO2 is dissolved in water? ›

The acid formed when sulphur dioxide dissolves in water is sulphurous acid H2SO3.

What happens when sulphuric acid is passed through water? ›

The sulphuric acid reacts with water producing a large amount of heat energy. While diluting, the concentrated sulphuric acid should be added to water because acid being heavier, it settles down and the evolved heat is dissipated in the water itself, and hence the spurting of acid.

Does sulphur dissolve in water to form sulphuric acid? ›

The correct answer of this question is option 'c', sulphur trioxide is not directly dissolved in water to form sulphuric acid because it results in the formation of dense fog of sulphuric acid which is difficult to condense.

What is the reaction of H2SO3 with water? ›

Sulfurous acid reacts in water as follows: H 2 S O 3 ( a q ) → H + ( a q ) + H S O 3 − ( a q ) ; K e q = 1.0 . The initial concentration of H 2 S O 3 is 1.0 M.

Would H2SO3 form an acid when dissolved in water? ›

When sulfur dioxide is dissolved in water, an acidic solution results. This has long been loosely called a sulfurous acid, H2SO3, solution. However, pure anhydrous sulfurous acid has never been isolated or detected, and an aqueous solution of SO2 contains…

Does H2SO3 behave as an acid when dissolved in water? ›

Answer and Explanation: Sulfurous acid (H2SO3) ( H 2 S O 3 ) behaves as an acid when added into H2O H 2 O . The first dissociation of sulfurous acid is shown below.

How is H2SO4 produced from SO2? ›

Sulphuric acid is made from SO2 gas by (i) oxidizing the SO2(g) to SO3(g) in contact with supported liquid-phase catalyst then (ii) reacting the resulting SO3(g) with the water component of 98.5 mass% H2SO4, 1.5 mass% H2O acid.

What does H2SO4 not react with? ›

Gold and platinum are noble metals in the sense that they remain unreactive. As a result, it doesn't react with sulphuric acid.

Is so2 a strong or weak acid? ›

A viscous, hydrogen bonded liquid; which is a good strongly acidic solvent. In dilute solutions in water it is a dibasic acid.

Is so2 dissolved in water acidic or basic? ›

When sulphur dioxide is dissolved in water, it liberates hydrogen cations in water (As sulphur dioxide becomes sulphurous acid). It makes the solution acidic.

Does so2 form a base when dissolved in water? ›

The correct answer is Sulphurous acid. Explanation: When sulphur dioxide is dissolved in water it forms Sulphurous acid.

Does sulphur dioxide increase the acidity of the water? ›

When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation. acidify waterways to the detriment of aquatic life.

What would happen if h2so4 is not added to water? ›

Hence, if we do not add sulphuric acid to water at the time of electrolysis, the conductivity will decrease and electrolysis becomes slow.

Why SO3 is not directly dissolved in water to form sulphuric acid? ›

Being nonpolar, SO3 doesn't dissolve in water which is a polar compound. Also the dissolution is exothermic on nature which causes fuming of water.

What happens when an acid is dissolved in water? ›

When an acid is dissolved in water, it furnishes hydrogen ions, and consequently, the concentration of hydrogen ions increases in the solution. The reaction is highly exothermic in nature due to the production of heat.

What acid is produced from SO2 reaction? ›

The sequential oxidation of sulfur dioxide followed by its hydration is used in the production of sulfuric acid. Sulfur dioxide dissolves in water to give "sulfurous acid", which cannot be isolated and is instead an acidic solution of bisulfite, and possibly sulfite, ions.

Which metal does not react with water or dilute H2SO4 but reacts with conc H2SO4? ›

Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. But, concentrated sulphuric acid is an oxidising agent. So, when copper is heated with conc. H2SO4, a redox reaction occurs and the acid gets reduced to sulphur dioxide.

Can H2SO4 be a weak acid? ›

Sulphuric acid ( H 2 SO 4 ) is a strong acid because: It completely ionizes or dissociates to form H + and SO 4 2 - when it is dissolved in water.

What does H2SO4 do in a reaction organic chemistry? ›

It is a concentrated acid that oxidizes, dehydrates, or sulfonates most of the organic compounds that often cause charring.

Does SO2 form a base when dissolved in water? ›

The correct answer is Sulphurous acid. Explanation: When sulphur dioxide is dissolved in water it forms Sulphurous acid.

Does SO2 produce a basic solution when dissolved in water? ›

Thus, addition of SO2 gas to water will produce an acidic solution.

What gas reacts with water to form Sulphuric acid? ›

This is done because when water is added directly to sulfur trioxide to produce sulfuric acid SO3(g)+H2O(l) → H2SO4(l) the reaction is slow and tends to form a mist in which the particles refuse to coalesce.


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2. H2SO3=SO2+H2O Balanced Equation||Sulfurous acid=Sulfur dioxide and Water Balanced Equation
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3. H2O+SO2=H2SO3 balance the chemical equation @mydocumentary838.
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4. How to Balance S + H2SO4 = H2O + SO2 (Sulfur + Sulfuric acid)
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