Question

The pH of 0.1 M solution of the following salts increases in
the order :
(a) NaCl < NH₄Cl < NaCN < HCl
(b) HCl < NH₄Cl < NaCl < NaCN
(c) NaCN < NH₄Cl < NaCl < HCl
(d) HCl < NaCl < NaCN < NH₄Cl

Answer 1

option b is correct

(b) HCl < NH₄Cl < NaCl < NaCN

we know that pH is the negative log of h+ concentration

$ph = - log(h + )$

so there is negative

we know h+ represents the acidic character

therefore the compound having more ph is more basic

in given things

1. NaCl
2. NH4Cl
3. NaCN
4. HCl

• we know HCl is the most acidic so it has least ph

then in remaining

• NaCl is formed by the strong base and strong acid so it has ph nearly equal to 7

• then NaCN is formed by strong base and weak acid so it is slightly basic then had ph greater than 7

• at last NH4Cl is formed by strong acid and weak base so it is slightly acidic it will have ph less than 7

hope it helps u,

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