sjc.cengagenow.com ing and learning resourc... Chegg Study Order Confirmation I

Question

sjc.cengagenow.com ing and learning resourc... Chegg Study Order Confirmation I Chegg.com Chapter 15- References) Use the References to access important values if n A solution contains 5.05x103 M nickel(lD) nitrate and 1.20x102 M silver acetate. Solid potassium cyanide is added slowly to this mixture. A. What is the formula of the substance that precipitates first? formula B. what is the concentration of cyanide ion when this precipitation first begins? CN Submit Answer Retry Entire Group 4 more group attempts remaining

Explanation / Answer

Ksp of Ni(CN)2 = 3.0*10^-23

kSP of AgCN = 2.2*10^-16

as Ksp of Ni(CN)2 is lesser than AgCN,it gets precipitate first.

A. formula that precipitate first = Ni(CN)2

B. [Ni2+] = 5.05*10^-3 M

   [CN-] = x

Ksp of Ni(CN)2 = [Ni2+][CN-]^2

(3.0*10^-23) = (5.05*10^-3)*X^2

X = 7.7*10^-11

[CN-] = 7.7*10^-11

answer: [CN-] = 7.7*10^-11 M

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