Answer:
H₃PO₄ + 3NaBr → 3HBr + Na₃PO₄
Explanation:
The unbalanced reaction expression is given as:
H₃PO₄ + NaBr → HBr + Na₃PO₄
We need to balance the expression.
Let us assign variable a, b, c and d and solve mathematically;
aH₃PO₄ + bNaBr → cHBr + dNa₃PO₄
Conserving H : 3a = c
P: a = d
O : 4a = 4d
Na: b = 3d
Br: b = c
Let a = 1, c = 3, d = 1, b = 3
So:
H₃PO₄ + 3NaBr → 3HBr + Na₃PO₄