ong Answer A) A solution containing AgNO3 is mixed with a solution of NaCI to fo

Question

ong Answer A) A solution containing AgNO3 is mixed with a solution of NaCI to form a solution that is 0.10 M in AgNO3 and 0.075 M in NaCI. What will happen once these solutions are mixed? Ksp (AgCI) 1.77 x 10- 10. Explain why. Be sure to include a discussion of Q and K (Note, no specific calculations necessary), and the level of saturation of the solution (unsaturated or saturated) B) A 10mL solution of Ix10-12 M AgNO3 is mixed with a 10mL solution 1x10-12 M NaCl. What will happen. Ksp (AgCl) 1.77 x 10-10. You do not need to show calculations. Be sure to include a discussion of Q and K, and the saturation level of the solution (saturated or unsaturated) C) Circle the compounds that will be more soluble in acidic solution than in pure water? Explain? Pb12 CuS Ca(CIO4)2 CuCl

Explanation / Answer

A.

AgCl (s) = Ag+ (aq.) + Cl- (aq.)

Qsp = [Ag+][Cl-]

Qsp = (0.10)(0.075)

Qsp = 7.50 * 10-3 SInce Qsp > Ksp, Precipitation occurrs.

B.

In the resulting solution,

[Ag+] = [Cl-] = 10 * 10-12 / 20 = 5.0 * 10-13 M

Qsp = ( 5.0 * 10-13 ) * ( 5.0 * 10-13 )

Qsp = 2.50 * 10-25

SInce Qsp < Ksp , no precipitation ocurrs.

C.

CuS is more soluble in acidic condition than in pure water.

CuS (aq.) = Cu2+ (aq.) + S2- (aq.)

Addition of acid, removes the sulphide ions to weak acid, and hence the above equilibrium is shifted in forward direction.

2H+ (aq.) + S2- (aq.) ----> H2S (aq.)

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