Asolution of 100.0 ml of 0.200 m koh is mixed with a solution of 200.0 ml of 0.150 m niso4. (a) write the balanced chemical equation for the reaction that occurs. (b) what precipitate forms? (c) what is the limiting reactant? (d) how many grams of this precipitate form? (e) what is the concentration of each ion that remains in solution?

a) 2KOH + NiSO₄ → Ni(OH)₂ + K₂SO₄

b) The precipitate that forms is Ni(OH)₂

c) We calculate the moles of each reagent:

0.1 L * 0.200 M KOH = 0.02 mol KOH

0.2 L * 0.150 M NiSO₄ = 0.03 mol NiSO₄

The amount of KOH needs to be twice the amount of NiSO₄, so for 0.03 mol NiSO₄ it would take 0.06 mol KOH. There are not as many, so KOH is the limiting reactant.

d) We calculate the amount of product formed using the limiting reactant:

0.02 mol KOH 1.8538 g Ni(OH)₂.

e) The final volume is 0.3 L

[K⁺] = 0.02 mol / 0.3 L = 0.067 M

[SO₄⁻²] = 0.03 mol / 0.3 L = 0.100 M

The Ni⁺² moles that reacted were: 0.02 mol KOH * = 0.01 mol Ni⁺²

[Ni⁺²] = 0.02 mol / 0.3 L = 0.067 M

a polar bond is formed when electrons are shared unevenly between atoms