Write the chemical equation for the reaction of carbonic acid (h2co3) with water.

Write the chemical equation for the reaction of ca

Answer

General guidance

Concepts and reason
One or more reactants combining together to form a product is called chemical reaction. Acid dissociation constant gives the strength of an acid in a solution. The strength of the acid is represented by the equilibrium constant expressionK.. After completing the given equation, the acid dissociation constant expression should be written for the equation.

Fundamentals

The weak acid dissociates in water and forms its conjugate acid and base. This reaction is an equilibrium reaction. The dissociation of acid in water at equilibrium can be written as:

НА + Н,О — Н,О +А-

The dissociation of a weak acid (НА) in water gives its conjugate Base (A) and water (base) gives its conjugate acid (Н,О).

- Equilibrium arrow. In equilibrium, the concentration of reactants and products cannot be changed with respect to time.

Ка is an equilibrium constant expression used for this kind of (acid –base dissociation) reaction to determine the strength of the acid in equilibrium.

[Products]
Kа
[Reactants

K.is calculated by the ratio of the concentration of reactants and concentration of the product.

Step-by-step

Step 1 of 2

The reaction of carbonic acid with water:

H2CO, H20
H0*+ HCO,

Chemical equation for the reaction of carbonic acid with water:

H2CO, H20
H0*+ HCO,


The dissociation of a weak acid () in aqueous solution () gives conjugate acid () and conjugate base ().

Step 2 of 2

The reaction is:

H2CO, H20
H0*+ HCO,

[Products]
reactants
НСО;
Ka HOHCO;
H,CO,H,0]

[Но[нсо;]
НСО,
Kа
[Н.Со,]

The acid – dissociation constant Ка is the ratio of the concentration of products Н,о
но |нсо; and concentration of reactants H,CO,]. [Н,О] is constant. Therefore, the final Каshould not contain [Н,О]. Therefore, option (a) is wrong.

In option (b), Каof reactants and product is reversed. Therefore, it is wrong.

In option (c), Каis reversed and there is no [но]concentration. Therefore, it is wrong.

In option (d), it satisfies the concentration ofКа. Therefore, it is a correct answer.

In option (e), the products in Каis wrong. Therefore, it is wrong.

In option (f), the concentration of [но]is not included. Therefore, it is wrong.

The Acid dissociation constant expression (acidity constant expression) for the reaction:

O

a

O

b

O

c

O

d

O

e

O

f


The acid – dissociation constant Ка is the ratio of the concentration of products Н,о
но |нсо; and concentration of reactants H,CO,]. [Н,О] is neglected due to constant. Therefore, the final Каvalue should not contain concentration of water.

Answer

Chemical equation for the reaction of carbonic acid with water:

H2CO, H20
H0*+ HCO,

The Acid dissociation constant expression (acidity constant expression) for the reaction:

O

a

O

b

O

c

O

d

O

e

O

f

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