H3PO4 + Ca(OH)2 → Ca(H2PO4)2 + H2O

Given question is incomplete. The complete question is as follows.

Balance the following equation:

The balanced chemical equation is as follows.

Explanation:

When a chemical equation contains same number of atoms on both reactant and product side then this equation is known as balanced equation.

For example,

Number of atoms on reactant side:

H = 5

P = 1

O = 6

Ca = 1

Number of atoms on product side:

H = 6

P = 2

O = 9

Ca = 1

In order to balance this equation, we will multiply by 2 on reactant side and we will multiply by 2 on product side. Hence, the balanced chemical equation is as follows.