a) Complete the chemical equations for the ionisation of phosphoric acid.
`H_3PO_3 rarr H^+ + H_2PO_4^(-)`(Dihydrogen phsophate ion)
`H_2PO_4^- rarr H^+ + ….....`(Hydrogen pgosphate ion)
`…............... rarr H^+ + PO_4^(3-)` (Phosphate ion)
b) How many types of salts can be formed by phosphoric acid? Why?
c) Write the chemical name of the follwing salts:
`Mg(H_2PO_4)_2 - `
`Mg(HPO_4) - `
`Mg_3(PO_4)- `

Explanation

a) .H_2PO_4^- rarr H^+ + HPO_4^-. (Hydrogen pgosphate ion)
. HPO_4^- rarr H^+ + PO_4^(3-). (Phosphate ion)
b) 3 types of salt are formed. .3H^+. ions are released from it.
c) Mg(H_2PO_4)_2 - Magensium phsophate
Mg(HPO_4) - Di Magnesium Phosphate
Mg_3(PO_4) - Tri Magnesium phospahte