Bhg Consider tit e following table of Ksp values. Which compound listed below ha

Question

Bhg Consider tit e following table of Ksp values. Which compound listed below has the greatest molar solubility in water? AgI CaF2 CdCO3 ZnCO3 Cd(OH)2 What is the pH of a buffer solution that is 0.172 M in hypochlorous acid (HCIO) and 0.131 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 Times 10^-8. 6.70 7.54 14.12 9.07 7.30 In which one of the following solutions is silver chloride the most soluble? 0.744 M LiNO3 0.181 M HCI 0.181 M NaCl pure water 0.0176 M NH3 Calculate the pH of a solution prepared by dissolving 0.85p mol of NH3 and 0.300 mol of NH4CI in water sufficient to yield 1.00 L of solution. The Kb of ammonia is 1.77 Times 10^5. 8.781 8.796 9.700 4.300 5.204

Explanation / Answer

8) gretest value of Ksp gretest solubility in water so

answer is (b) CaF2

9)  HClO > (H+) + (ClO-)

Use the buffer equation pH = pKa + log(base/acid)
pKa is -log(Ka) = -log(3.8 x 10^-8)
the base is (ClO-), and the acid is (HClO)

pH = -log(3.8 x 10 ^-8) + log(0.172M/0.131M) = 7.54 pH

so answer is (b) 7.54

10)  It would be most soluble in pure water, because of the common ion effect. so answer is (d) pure water

11) pKa + log(base/acid)

pKb is -log(Kb) = -log(1.77 x 10^-5)

pOH = -log(1.77 x 10^-5) + log (0.850/0.300)

p OH = 5.2043

pH = 14 - 5.2043 = 8.796

so answer is (b) 8.796

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