a) Silver thiocyanate is often used as a test for silver ion in qualitative anal

Question

a)

Silver thiocyanate is often used as a test for silver ion in qualitative analysis. Using the solubility product constant (Ksp = 1.1E-12), calculate the molar solubility of silver thiocyanatein water.

s = _____M

b)

Magnesium ammonium phosphate is an unusual salt in that it dissolves to form Mg2+, NH4+, and PO43- ions. The Ksp for magnesium ammonium phosphate is 2.5E-13. Calculate its molar solubility and its solubility in grams per liter.

= _____M

= _____g/L

c)

For iron(III) hydroxide, Fe(OH)3, Ksp equals 2.5E-39. Calculate: (a) its molar solubility (recall that taking the square root twice gives the fourth root); (b) the pOH of the saturated solution.

(a) = _____M

pOH = _____

Explanation / Answer

Silver thiocyanate is often used as a test for silver ion in qualitative analysis. Using the solubility product constant (Ksp = 1.1E-12), calculate the molar solubility of silver thiocyanatein water.

Solution:

AgSCN --> Ag+ + SCN-

Ksp = [Ag+] [SCN-]

Now if solubility of AgSCN = x

then [Ag+] = [SCN-] = x

1.1 X 10^-12 = x X x

so x = 1.048 X 10^-6 molar

so solubility of AgSCN = 1.048 X 10^-6 molar

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