An acidified solution of 0.05 M Zn2+ is saturated with 0.1 M H2S. What is the minimum molar concentration (M) of H+required to prevent the precipitation of ZnS?Use Ksp (ZnS) = 1.25 × 10–22 and Overall dissociation constant of H2S , KNET = K1K2 = 1 × 10–21

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answer is 0.20.

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Detailed Solution

For ppt, Zn+2S−2=KspS−2=1.25×10−220.05= 2.5 × 10–21 M H2S⇌2H++S−2KNet=10−21=H+2×2.5×10−210.1H+2=125H+=15M=0.2M

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