[mike]

Ok, but your calculations are a bit wrong. Firstly the original question says that you have 1.00M solutions of your salts so you will need to measure out volumes of the reactants, ie how many mL's of AgNO3 solution of 1.00M is required to make 50g (0.59moles) of NaNO3. Second don't forget that for every 1 mole of silver nitrate you only need 1/3 as much Na3PO4.

Otherwise it is looking good.

[wereworm73]

In Step 4, you're filtering out the precipitated Ag₃PO₄.  There shouldn't be any Na₃PO₄ left at this point, just NaNO₃ & water.

[mike]

In Step 4, you're filtering out the precipitated Ag3PO4.  There shouldn't be any Na3PO4 left at this point, just NaNO3 & water.

Yes, good catch there wereworm definitely filtering out the solid Ag₃PO₄