An aq soln of #NaH_2PO_4# is treated with a mixture of ammonium & magnesium ions to precipitate #Mg(NH_4)PO_4. 6H_2O# & is heated to #Mg_2P_2O_7# which is weighed. A soln of #NaH_2PO_4# gives 1.054 g of #Mg_2P_2O_7#. What's original weight of #NaH_2PO_4#?
1 Answer
The original mass of
Explanation:
It is tempting to write out the balanced equations for the reactions, but you can avoid doing this.
You know that phosphorus atoms must be conserved, so the overall reaction must be
Now we can do the usual stoichiometry calculations and convert
Addendum
The balanced equations are