Question

A weak acid react with strong base ionisation constant of weak acid is 10^-4

Answer 1

Explanation:

The equilibrium constant will be 1\times 10^{10}1×10

10

.

Explanation: Dissociation of weak acid is given as:

HA\rightleftharpoons H^++A^-HA⇌H

+

+A

−

K_a=\frac{[H^+][A^-]}{[HA]}=10^{-4}K

a

=

[HA]

[H

+

][A

−

]

=10

−4

.....(1)

Dissociation of water can be written as:

H_2O\rightleftharpoons OH^-+H^+H

2

O⇌OH

−

+H

+

K_w=[H^+][OH^-]K

w

=[H

+

][OH

−

] .....(2)

K_w=10^{-14}K

w

=10

−14

(Constant)

Reaction of strong base (BOH) with weak acid can be written as:

HA+OH^-\rightleftharpoons H_2O+A^-HA+OH

−

⇌H

2

O+A

−