A solution contains 714E3 M nickel nitrate and 797E3 M coppe

A solution contains 7.14E-3 M nickel nitrate and 7.97E-3 M copper(II) acetate.

Solid sodium hydroxide is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

B. What is the concentration of hydroxide ion when this precipitation first begins?

[hydroxide] = ???M

ksp of nickel hydroxide=2*10^-16

ksp of copper hydroxide=2*10^-19

so we can see that the ksp of copper hydroxide is less so it will precipitate first.

A)Cu(OH)2

B)ksp=[Cu2+][OH-]^2

or 2*10^-19=7.97*10^-3*[OH-]^2

or [OH-]=5*10^-9 M