# Worksheet on Hydrolysis

Hydrolysis is a chemical process in which the molecule of water are splited into hydrogen cations and hydroxide anions.

This is a reaction which is used to break certain polymer, especially those ploymer which are made by the process of condensation reaction.

Questions:

1. The Hydrolysis of a salt of strong acid and weak base is called:

(a)    Neutrals hydrolysis

(b)   Anionic hydrolysis

(c)    Cationic hydrolysis

(d)   Amphoteric hydrolysis

2. The value of Kb for the reaction $B^+ + H_2O \leftrightharpoons BOH + H^+ \text{is} 1.0 \times 10^{-6}$. The hydrolysis constant of the salt:

(a)    $10^{-8}$

(b)   $10^{-7}$

(c)    $10^{-6}$

(d)   $10^{-7}$

3. The dissociation constant of $CHCOOH$ is $1.8 \times 10^{-5}$. The hydrolysis constant of sodium acetate is:

(a)    $5.46 \times 10^4$

(b)   $5.56 \times 10^{-10}$

(c)    $1.8 \times 10^{-6}$

(d)   $1.8 \times 10^{-6}$

4. A weak acid HX has dissociation constant $1 \times 10^{-5}$. It forms a salt NaX on reaction with an alkali. The degree of hydrolysis of 0.1 M solution of NaX is:

(a)    0.01%

(b)   0.001%

(c)    0.1%

(d)   0.15%

5. Ammonium cyanide is a salt of $NH_4OH$ of $Kb = 2.5 \times 10^{-5}$ and HCN of $Ka = 4.0 \times 10^{-10}$. The hydrolysis constant of $NH_4OH \hspace{2mm}at \hspace{2mm} 25^0 C$ is:

(a)    4.6

(b)   4.4

(c)    2.4

(d)   1.4

6. At $80^0C$ distilled water concentration is equal to $1 \times 10^{-6}mole-litre^{-1}$  the value of Kw at this temperature will be:

(a)    $1 \times 10^{-9}$

(b)   $1 \times 10^{-12}$

(c)    $1 \times 10^{-6}$

(d)   $1 \times 10^{-14}$

7. The concentration of $H^+$ and $OH^-$ of a 0.1 aqueous solution of 2% ionized weak acid is [ ionic product of water $= 1 \times 10^{-14}$ ]:

(a)    $3 \times 10^{-2}M \text{and} 3 \times 10^{-13}M$

(b)   $0.1 \times10^{-3} M \text{and} 5 \times 10^{-11}M$

(c)    $0.2 \times 10^{-3}M \text{and} 5 \times 10^{-11}M$

(d)   $2 \times 10^{-3}M \text{and} 5 \times 10^{-12}M$

8. Two solutions A and B are prepared by adding NaOH and HCI acid into water respectively. The ionic product of water will:

(a)    increase in B and decrease in A

(b)   increase in A and B

(c)    remain the same in both solutions

(d)   increase in A and decrease in B

9. The value of ionic product of water at 393 K is:

(a)    equal to $1.0 \times 10^{-7}$

(b)   greater than $1.0 \times 10^{-14}$

(c)    less than $1.0 \times 10^{-14}$

(d)   equal to $1.0 \times 10^{-14}$

10. What happens when few drops of $H_2SO_4$ are added to water?

(a)    $OH^-$ concentration decreases

(b)   $OH^-$ concentration increases

(c)    ionic product increases

(d)   ionic product decreases

11. If the hydronium ion concentration in a solution is $1 \times 10^{-5} m0le-litre^{-1}$, then the concentration of $OH^-$ ions in this solution is $(Kw = 10^{-14})$

(a)    $10^{-6}$

(b)   $10^{-6}$

(c)    $10^{-6}$

(d)   $10^{-6}$

12. The hydrogen ion concentration of 0.001 N NaOH solution is $(Kw = 10^{-14} mol^2-L^{-2} )$:

(a)    $1 \times 10^{-11}M$

(b)   $1 \times 10^{-13} M$

(c)    $1 \times 10^{-12} M$

(d)   $1 \times 10^{-14} M$