Question

When 22.0 mL of a 5.89×10-4 M sodium hydroxide solution is combined with 12.0 mL of a 5.49×10-4 M silver fluoride solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to

Answer 1

The balanced reaction will be as follows:

Molarity of Ag+ ions after mixing can be calculated as follows:

where M1 and V1 are the molarity and volume of the initial Ag+ ions and M2 and V2 are the molarity and volume of the final Ag+ ions.

Putting the values in equation (1)

Similarly Molarity of OH- ions can be calculated as:

where M1 and V1 are the molarity and volume of the initial OH- ions and M2 and V2 are the molarity and volume of the final OH- ions.

The reaction quotient of AgOH can be calculated as:

Literature value of Ksp of AgOH is 1.52×10-8 .

Since Q > Ksp , hence precipitation of AgOH will occur.

Conclusion: Yes, the precipitate of AgOH will be formed and the Q = 7.39 ×10-8.