In two or more complete sentences explain how to balance the chemical equation and classify its reaction type.
_h3po4 + __nabr __hbr + _na3po4

H₃PO₄ + 3NaBr   →    3HBr + Na₃PO₄

Double displacement reaction

Explanation:

Chemical equation:

H₃PO₄ + NaBr   →    HBr + Na₃PO₄

Balanced chemical equation:

H₃PO₄ + 3NaBr   →    3HBr + Na₃PO₄

Steps to balance:

H₃PO₄ + NaBr   →    HBr + Na₃PO₄

H = 3                           H = 1

P =  1                           P = 1

O =  4                          O = 4

Na =1                         Na = 3

Br =  1                        Br = 1

We will add the coefficient 3 with NaBr.

H₃PO₄ + 3NaBr   →    HBr + Na₃PO₄

H = 3                           H = 1

P =  1                           P = 1

O =  4                          O = 4

Na = 3                        Na = 3

Br =  3                        Br = 1

Now we will add the coefficient 3 with HBr.

H₃PO₄ + 3NaBr   →    3HBr + Na₃PO₄

H = 3                           H = 3

P =  1                           P = 1

O =  4                          O = 4

Na = 3                        Na = 3

Br =  3                        Br = 3

Now equation is completely balanced.

The reaction type is double displacement reaction.

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD