Enter an equation for the precipitation reaction that occurs (if any) when solutions of potassium hydroxide and nickel(ii) bromide are mixed. express you answer as a chemical equation including phases.

The chemical equation is written below.

Explanation:

Precipitation reaction is defined as the reaction in which an insoluble salt is formed when two solutions are mixed containing soluble substances. The insoluble salt settles down at the bottom of the reaction mixture.

The chemical equation for the reaction of potassium hydroxide and nickel (II) bromide follows:

By Stoichiometry of the reaction:

2 moles of aqueous solution of potassium bromide reacts with 1 mole of nickel (II) bromide to produce 1 mole of solid nickel (II) hydroxide and 2 moles of potassium bromide

Hence, the chemical equation is written above.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-