Will a precipitate (ppt)form when 300.mL of 5.0 × 10^-5 M AgNO₃ are added to 200.mL of 2.5 × 10^-7 M NaBr? Answer yes or no, and identify the precipitate if there is one.

Question

Quizplus · Accepted Answer

To determine if a precipitate will form, we need to find the solubility product constant (Ksp) of the possible products, AgNO3 and NaBr. The Ksp of AgNO3 is 1.0 x 10^-4 and the Ksp of NaBr is 5.0 x 10^-6.

To find out if a precipitate will form, we need to calculate the ion product (Q) by multiplying the concentrations of the ions that will react with each other.

Q = [Ag+] [Br-]

[Ag+] = 5.0 x 10^-5 M (from 5.0 x 10^-5 M AgNO3) 
[Br-] = 5.0 x 10^-8 M (from 2.5 x 10^-7 M NaBr)

Q = (5.0 x 10^-5)(5.0 x 10^-8) = 2.5 x 10^-12

Since Q is less than Ksp of AgNO3 but greater than Ksp of NaBr, a precipitate of AgBr will form. Therefore, the answer is B.

Will a Precipitate (Ppt)form When 300