Molybdate-phosphate reaction

[shafaifer]

Is something here correct?

Let us say you have this salt: Na₃PO₄, to this salt you add HCl(aq):

Na₃PO₄(s) + 3HCl(aq) --> 3NaCl(aq) + PO₄^3-(aq) + 3H⁺(aq) (equation 1)

 

Now phosphate reacts with added molybdate, then added HCl(aq):

 

PO₄^3-(aq) + 3NH₄⁺(aq) + 12Mo²⁺(aq) --> (NH₄)₃[PMo₁₂O₄₀](s) (equation 2)

 

 

According to a lab manual, the product on the right side of the reaction in Eq. 2 is correct. The manual only says that phosphate reacts with molybdate and creates the product in equation 2 - not what the reactions in question look like. I cannot balance the left side of Eq. 2, how is it done?

 

Best regards,

 

Shafaifer

Edited June 13, 2014 by shafaifer