Depression of freezing point of 0.01 molal aqueous CH 3 COOH is 0.019 8 ∘ C . 1 molal urea solution freezes at − 1. 8 ∘ C . Assuming molarity is equal to molality, pH of CH 3 COOH solution is :

Question

Depression of freezing point of 0.01 molal aqueous CH 3 ​ COOH is 0.019 8 ∘ C . 1 molal urea solution freezes at − 1. 8 ∘ C . Assuming molarity is equal to molality, pH of CH 3 ​ COOH solution is :

TestHub · Accepted Answer

For urea, Δ T f ​ = K f ​ × m ∴ K f ​ = m Δ T f ​ ​ = 1 1.8 ​ = 1.8 Now, for CH 3 ​ COOH Δ T f ​ = i × K f ​ × m ∴ i = 1.1 Thus, i = 1 + α so α = 0.1 Now, [ H + ] = C α = 0.01 × 0.1 = 1 0 − 3 M ∴ pH = 3

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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