Look at your unbalanced equation:

Al^3+ + Na3PO4 → Na^+ + AlPO4

How do I use the ratio of AlPO4 to Al3+ to determine the number of moles of aluminum ions?

the increase of protons   hope this

it would be a gas formation

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.