QUESTION1 Arower the questions below about the sparingy sokuble salts, Pcly andd

Question

QUESTION1 Arower the questions below about the sparingy sokuble salts, Pcly andd Pof in whikch agutous solutien weil Phclg be least soluble? h which aqurous solution will Pbf2 be most soluble A0.10 M HNO3 0.10 M NaC C 0.10 M Baci QUESTION 2 of water at this temperature 100 C. the w for pure water i 2.0010-15, Wht s the p 0 727 7.47 6.77 6.92 QUESTION 3 What h the pHofw, aqueous saton of 0.107 M benzor acdHC7H502, ?.2" ?. ??-63.10 5 for benoe aco write your answer with 2detinnal places to the right of decimal pein.

Explanation / Answer

1. The correct answer is option C, i.e. 0.1 M BaCl2.

Reason: Due to the common ion effect of Cl- ions, the solubility of PbCl2 is the least and due to the absence of common ion effect, the solubility of PbF2 is the highest.

2. At 10 oC, Kw of pure water = 2.93*10-15

i.e. [H+][OH-] = 2.93*10-15

i.e. [H+]2 = 2.93*10-15 (since [H+] = [OH-] in pure water)

i.e. [H+] = (2.93*10-15)1/2 = 5.413*10-8

Now, pH = -Log[H+] = -Log(5.413*10-8) = 7.27 (option 1)

3. pH = 1/2 (pKa - Log[benzoic aicd])

i.e. pH = 1/2 (4.2 - Log 0.107)

i.e. pH = 2.585

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