CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES
CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES
3rd Edition
ISBN: 9781337739382
Author: Brown
Publisher: CENGAGE L
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Chapter 12, Problem 12.64PAE

(a)

Interpretation Introduction

To determine: Calculate the KSP (Solubility product), if solubility of AgCN=7.73×109M

(a)

Expert Solution
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Explanation of Solution

AgCN(S)Ag+(aq)+CN(aq)KSP=[Ag+][CN]

Solubility of AgCNis 7.73×109M, it means that

Concentration of Ag+([Ag+]) at equilibrium =1×7.73×109M.

Concentration of CN([CN]) at equilibrium =1×7.73×109M.

[Ag+]=7.73×109M[CN]=7.73×109MKSP=[Ag+][CN]=7.73×109×7.73×109=5.98×1017

Hence KSP of CNCN=5.98×1017.

(b)

Interpretation Introduction

To determine: Calculate KSP of Ni(OH)2. If solubility is 5.98×1017M.

(b)

Expert Solution
Check Mark

Explanation of Solution

Ni(OH)2(S)Ni2++2OH

1 Mole of Ni(OH)2 gives 1 mole Ni+0 and 2 moles OH.

Solubility Ni(OH)2 is 5.16×106M.

[Ni2+]=1× solubility of Ni(OH)2=5.16×106M[OH]=2× Solubility of Ni(OH)2=2×(5.16× 10 6M)=10.32×106M

From the definition of solubility product.

KSP=[Ni2+][OH]2

Putting the value in R.H.S. you get

=(5.16× 10 6M)(10.32× 10 6M)=5.50×1016M

Hence solubility product of Ni(OH)2=5.50×1016M.

(c)

Interpretation Introduction

To determine: Calculate KSP of Cu3(PO4)2. Solubility is 1.67×108M.

(c)

Expert Solution
Check Mark

Explanation of Solution

Cu3(PO4)2(S)3Cu2+(aq)+2PO42(aq).

From the above balanced equilibrium reaction it becomes clear that 1 mole of Cu3(PO4)2(S) gives 3

Cu2+(aq) and 2 moles of PO42(aq).

The solubility of Cu3(PO4)2(S) is 1.67×108M.so at equilibrium

[Cu2+]=3× slubility of Cu3(P O 4)2[PO42]=2× solubility of Cu3(P O 4)2

So,

[Cu2+]=3×1.67×108M[PO42]=2×1.67×108M

From the definition of solubility product.

KSP=[Cu 2+]3[PO4 2]2=(5.01× 10 8)3(3.34× 10 8)23=1.40×1037

Hence solubility product of Cu3(PO4)2is 1.40×1037.

Conclusion

You have learnt that how to find the KSP from the solubility of a given salt.

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Chapter 12 Solutions

CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES

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