Answer:
The answer to your question is " 3 "
Explanation:
Equation = ?
Phosphoric acid = H₃PO₄
Calcium hydroxide = Ca(OH)₂
This is an acid base reaction because there is an exchange of hydrogens.
Reaction
H₃PO₄ + Ca(OH)₂ ⇒ Ca₃(PO₄)₂ + H₂O
Balance
Reactants Elements Products
1 P 2
1 Ca 3
5 H 2
6 O 9
The reaction is unbalanced
2H₃PO₄ + 3Ca(OH)₂ ⇒ Ca₃(PO₄)₂ + 6H₂O
Balance
Reactants Elements Products
2 P 2
3 Ca 3
12 H 6
14 O 14
Now, the reaction is balanced, the coefficient of Calcium hydroxide is 3
