Solid NaBr is slowly added to a solution that is 0.073 M in Cu+ and 0.073 M in Ag+.Which compound will begin to precipitate first?AgBrCuBrWhat percent of Ag remains in solution at the point when CuBr just begins to precipitate?

Answer :

AgBr should precipitate first.

The concentration of when CuBr just begins to precipitate is,

Percent of remains is, 0.0018 %

Explanation :

for CuBr is

for AgBr is

As we know that these two salts would both dissociate in the same way. So, we can say that as the Ksp value of AgBr has a smaller than CuBr then AgBr should precipitate first.

Now we have to calculate the concentration of bromide ion.

The solubility equilibrium reaction will be:

The expression for solubility constant for this reaction will be,

Now we have to calculate the concentration of silver ion.

The solubility equilibrium reaction will be:

The expression for solubility constant for this reaction will be,

Now we have to calculate the percent of remains in solution at this point.

Percent of remains =

Percent of remains = 0.0018 %

the volume increases