What Is the Composition of the Precipitate Formed When H₂S

question 99

Multiple Choice

What is the composition of the precipitate formed when H₂S gas is bubbled through 1.0 litre of a solution of 0.010 M Zn²⁺,0.010 M Pb²⁺,and 0.010 M Mn²⁺,buffered at pH 2.0,until 0.10 mol of H₂S has been added?
(K_sp values are: ZnS: 1.6 × 10^-23;MnS: 7.0 × 10^-16;PbS: 7.0 × 10^-29.For H₂S,K_a1 = 1.0 × 10^-7;K_a2 = 1.3 × 10^{-13 )} .

• A)only ZnS
• B)only MnS
• C)only PbS
• D)only MnS and PbS
• E)only ZnS and PbS

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