(Solved): A solution contains 5.54103M sodium cyanide and 1.23102M potassium hydroxide. Solid nicke ...

A solution contains $5.54\times 10^{?3}\mathrm{M}$ sodium cyanide and $1.23\times 10^{?2}\mathrm{M}$ potassium hydroxide. Solid nickel(II) acetate is added slowly to this mixture. A. What is the formula of the substance that precipitates first? $\text{ formula }=$ B. What is the concentration of nickel ion when this precipitation first begins? $\left[{\mathrm{Ni}}^{2+}\right]=\mathrm{M}$