The solubility of Sr_3(PO_4)_2 in 0.25 M Na_3PO_4 is 6.19 times 10^-10 M. Calcul

Question

The solubility of Sr_3(PO_4)_2 in 0.25 M Na_3PO_4 is 6.19 times 10^-10 M. Calculate K_SP for Sr_3(PO_4)_2 Silver carbonate Ag_2CO_3 has a K_SP = 8.1 times 10^-10. A solution is prepared by mixing 50.0 mL of 4.0 times 10^-10 M AgNO_3 with 50.0 mL of 2.2 times 10^-9 M Na_2CO_3. Determine the solubility quotient, Q_SP. Does a precipitate form? Iron (III) hydroxide Fe(OH)_3 has a K_SP = 4.0 times 10^-38 at 25 degree C. Determine the molar solubility of Iron (III)hydroxide at this temperature. (a) In pure water. (b) At a pH = 5

Explanation / Answer

1)

Solubility, s = 6.19*10^-10 M

Sr3(PO4)2   <—> 3Sr2+   +   2PO43-

                   3s           2s

Ksp = [Sr2+]^3 * [PO43-]^2

Ksp = (3s)^3 * (2s)^2

Ksp = 27*s^3 * 4*s^2

Ksp = 108*s^5

Ksp = 108 * (6.19*10^-10)^5

= 9.81*10^-45

Answer: 9.81*10^-45

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