The magnesium was dissolved in dilute nitric acid. Sodium hydroxide, hydrobromic acid, sodium phosphate were added

The magnesium was dissolved in dilute nitric acid. Sodium hydroxide, hydrobromic acid, sodium phosphate were added to the resulting solution. Write the equations for the described reactions.

4Mg + 10HNO3  → 4Mg(NO3)2 + N2O↑ + 5H2O
Mg(NO3)2 + 2NaOH → Mg(OH)2↓ + 2NaNO3
Mg(OH)2 + 2HBr → MgBr2 + 2H2O
3MgBr2 + 2Na3PO4 → Mg3(PO4)2↓ + 6NaBr

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