Question

The Ksp for Ag2CrO4 is 9.0 x 10-12. If 200 mL of 0.0050 M AgNO3 is combined with 300 mL of 0.0020 M K2CrO4, will a precipitate form?

Answer 1

Qsp > ksp

Step-by-step explanation:

given data

Ag2CrO4 = 9.0 ×
`10^(-12)`

solution

new [
`Ag^+`] =
`(0.005 * 200)/(200+300)` = 0.002 M .................1

and

new [
`CrO^(2-)_4`] =
`(0.002 * 300)/(200+300)` = 0.0012M ..............2

so here solubility equation will be as

`Ag_2CrO_4(s)` ⇄ 2
`Ag^+` (aq) +
`CrO^(2-)_4` (aq) ......................3

so

Qsp =
`[Ag^+]^2` [
`CrO^(2-)_4`]

put here value

Qsp = (0.002)² × (0.0012)

Qsp = 4.80 ×
`10^(-9)`

so that we can say that Qsp > ksp