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If the freezing point of 0.1M HA(aq) solution is -0.2046°C then pH of the solution is? (Kf of water=1.86/mol kg) 1) 1 2)1.3 3)1.7 4)2

If the freezing point of 0.1M HA(aq) solution is -0.2046°C then pH of the solution is? (Kf of water=1.86/mol kg) 
1) 1     2)1.3    3)1.7     4)2

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1 Answers

Aastha Singh
askIITians Faculty 212 Points
5 years ago
Dear student,
pH varies widely with concentration of the solution, if the concentration of acid is very high like in this case [0.1M], the H+ions concentration of just the acid HA will be considered and contribution of water to H+ions will be ignored.
pH = -log[H+] only from acid in this case and not water since concentrated solution.
pH = -log[0.1] =-log[10-1]= -(-1)= 1.

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