0.1 molal aqueous solution of a weak acid {H}-{A} freezes at -0.0223^\circ{C}. Calculate the {pH} of above solution, assuming molarity = molality. (Given {K}_{{t}}=0.1860, \log 2=0.3, At. mass of {H}= 1, {C}=12, {O}=16 )

JEE Advanced 2021 Full Test 3 Paper 2

SECTION – C (Numerical Answer Type)
This section contains 06 questions. The answer to each question is a NUMERICAL VALUE. For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the SECOND DECIMAL PLACE; e.g. XXXXX. XX).

Question : 33 of 54

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0.1 molal aqueous solution of a weak acid H−A freezes at −0.0223°C. Calculate the pH of above solution, assuming molarity = molality. (Given Kt=0.1860,log‌2=0.3, At. mass of H= 1,C=12,O=16 )

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HAaq	⇌	Haq+	+	Aaq−
C−Cα‌	‌	Cα	‌	Cα