What effect will adding 50.0 mL of 1.0 M NaCl have on 100.0 mL of a saturated so

Question

What effect will adding 50.0 mL of 1.0 M NaCl have on 100.0 mL of a saturated solution of AgCl (Ksp = 1.8 x 10-10)?

no effect

The correct answer is

BUT WHY!!???

Question

23 of 25

Which one of the following compounds will increase in solubility if the pH of a saturated solution of the compound is lowered?

THE CORRECT ANSWER IS

decrease the concentration of chloride ions result in the production of chlorine gas reduce the solubility of the silver chloride precipitation of excess sodium chloride

no effect

The correct answer is

reduce the solubility of the silver chloride

BUT WHY!!???

Explanation / Answer

Question :

What effect will adding 50.0 mL of 1.0 M NaCl have on 100.0 mL of a saturated solution of AgCl (Ksp = 1.8 x 10-10)?

AgCl will have common ion effect, so it will shift its equilibrium toward solid AgCl, hwich implies solubility decreases

Which one of the following compounds will increase in solubility if the pH of a saturated solution of the compound is lowered?

in order to increase solubility, the shift must go from solid to aqueous ions

From th elist, none will do but Cr(OH)3

note that

Cr(OH)3 --< Cr+3 + 3OH-

and

H+ (acid) reacts with 3OH- --< H2O

then

the shift favours more aqueous OH- generation, so more solid must dissolve

solubility will increase

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