Question

For each of the salts on the left, match the salts on the right that can be compared directly, using K_sp values, to estimate solubilities.

(If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.)

	1.	silver sulfate		A. PbI2
	2.	copper(II) carbonate		B. CaCO3
				C. CaCrO4
				D. Ca3(PO4)2

Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.

silver sulfate			copper(II) carbonate
Ksp =	K3		Ksp =	K2

Note: Multiply out any number and put it first in the K_sp expression. Combine all exponents for s.

For each of the salts on the left, match the salts on the right that can be compared directly, using K_sp values, to estimate solubilities.

(If more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.)

	1.	nickel(II) cyanide		A. PbI2
	2.	calcium carbonate		B. AgCl
				C. AgBr
				D. PbCO3

Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.

nickel(II) cyanide			calcium carbonate
Ksp =	K3		Ksp =	K2

Note: Multiply out any number and put it first in the K_sp expression. Combine all exponents for s.

Answer 1

Silver sulfate = Ag2SO4, hence the value of Ksp = 4s^3, where s is the solubility of SO4(2-)

Hence the correct answer for silver sulfate will be PbI2

Copper II carbonate will be Cu(+2) + CO3(2-) it will be s^2, which will be similar to CaCO3

CaCrO4 will be similar to NaCl,KCl,MgO,CaO

Ca(3)(PO4)2 ---- Mg3(PO4)2, Ba3(PO4)2

Ksp of silver sulfate = (2s)^2*s = 4s^3

Ksp of CuCO3 = s^2

Nickel (II) Cyanide = Ni(CN)2, it will be also equal to 4s^3

CaCO3 will be equal to s^2 again