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.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be