Following 3 columns contain informations regarding water solubility of some sparingly soluble salts and its relation with their solubility product constants (K sp ) Take temperature as 25ºC.
Column-1 | Column-2 | Column-3 | |||
(I) | Solubility > | (i) | Solubility increases because of presence of common anion in solution | (P) | Solubility increases in acidic solution as pH decreases below 3 |
(II) | Solubility < | (ii) | Solubility decreases because of presence of common cation in solution | (Q) | Solubility increases in basic solution as pH increases above 11 |
(III) | Solubility = | (iii) | Solubility decreases because of presence of common anion in solution | (R) | Solubility is unaffected by pH of solution |
(IV) | Solubility = | (iv) | Solubility increases because of presence of common cation in solution | (S) | Anionic hydrolysis will make solubility in water greater than expected |
(i) For AgCN, the only correct combination is :
Text Solution
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(i) AgCN(s) 
Ag + (aq) + CN – (aq) ...
CN – (aq) + H 2 O 
HCN + OH – (Anionic hydrolysis) …
AgCN + CN – 
[Ag(CN) 2 ] – (Complex formation) …
Equation will make Eq. shift forward. So, solubility > 
. Solubility in acidic solution would be high because of reaction : CN – + H + 
HCN
Eq. will increase solubility of salt in presence of common anion (CN – ).
(ii) Al(OH) 3 (s) 
Al 3+ (aq) + OH – (aq) ...
Al(OH) 3 (s) + OH – (aq) 
[Al(OH) 4 ] – (aq) ...
Al(OH) 3 , expected to be having very less K sp value, will face common ion effect by OH – ions present in water. So, solubility < 
.
Acidic medium will making Eq. shift forward by consuming OH – ions leading to greater solubility.OH – ions (basic medium as well as common anion) will increase solubility by making Eq. shift forward.
(iii) PbS(s) 
Pb 2+ (aq) + S 2– (aq) ...
S 2– (aq) + H 2 O 
HS – (aq) + OH – (aq) ... (Anionic hydrolysis)
Eq. will make Eq. shift forward. So, solubility > 
. Solubility in acidic solutions would be higher because of reaction : S 2– + H + 
HS –
Presence of common cation or anion will both make Eq. shift backward leading to decrease in solubility.
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