Home
Class 12
CHEMISTRY
An aqueous solution of hydrogen sulphide...

An aqueous solution of hydrogen sulphide shows the equilibrium: `H_(2) S hArr H^(o+)+HS^(ɵ)`
If dilute hydrochloric acid is added to an aqueous solution of `H_(2)S`, without any change in temperature, the
a. The equilibrium constant will change.
b. The concentration `HS^(ɵ)` will increase.
c. The concentration of un-dissociated hydogen sulphide will decrease.
d. The concentration of `HS^(ɵ)` will decrease.

A

The equilibrium constant change

B

The concentration `HS^(-)` will increase

C

The concentration of un-dissociated hydrogen sulphide will decrease

D

The concentration of `HS^(-)` will decrease

Text Solution

Verified by Experts

The correct Answer is:
D
`H_(2)S(aq) rarr H^(+)(aq) + HS^(-)(aq)`
Adding of dilute HCl(aq) will increase the concentration `H^(+)` ions in the solution leading to a backward shift in the reaction to re-establish the equilibrium state. This means the concentration of `HS^(-)` decreases.
Promotional Banner

Similar Questions

Explore conceptually related problems

The pH of a solution is 5.0 To this solution sufficient acid is added to decreases the pH to 2.0. The no. of times the concentration of H^(+) increased is

Ammonium hydrogen sulphide dissociated according to the equation, NH_4HS(s) hArr NH_3(g) +H_2S(g) . If the observed pressure of the mixture is 1.12 atm at 106^@C , what is the equilibrium constant K_p of the reactions ?

In an aqueous solution of voume 1000 ml, the following reation reached at equilibrium 2Ag^(+) (aq) +Cu (s) hArr Cu^(2+) (aq)+2Ag (s) The concentration of Cu^(+2) is 0.4 M at equilibrium, 3000 ml of water now added then concentration of Cu^(-2) at new equilibrium is

A : Increasing the concentration of H_2 will increases magnitude of equilibrium constant of the reaction H_2 +I_2 hArr 2HI R: Value of K_c depends upon the concentration of reactants and products taken.

The dissociation constant of H_(2)S and HS^(-) are respectively 10^(-7) and 10^(-13) . The pH of 0.1 M aqueous solution of H_(2)S will be