# What is the balanced reaction equation between calcium hydroxide and phosphoric acid (Ca(OH)_2andH_3PO_4)?

Feb 12, 2016

#### Answer:

It helps to write out the ions

#### Explanation:

Since $H$ is always ${H}^{+}$ we may conclude that the rest is $P {O}_{4}^{-} 3$
Also The $O H$-part is $O {H}^{-}$, so that calcium is Ca^(2+

To make this work we need $3 C {a}^{2 +}$ to balance with $2 P {O}_{4}^{3 -}$

Or: $3 C {a}^{2 +} + 2 P {O}_{4}^{3 -} \to C {a}_{3} {\left(P {O}_{4}\right)}_{2}$

And for the whole equation:

$3 C a {\left(O H\right)}_{3} + 2 {H}_{3} P {O}_{4} \to C {a}_{3} {\left(P {O}_{4}\right)}_{2} + 3 {H}_{2} O$