What amount of sodium hydroxide should be added to 4.8 mol of phosphoric acid to obtain

What amount of sodium hydroxide should be added to 4.8 mol of phosphoric acid to obtain a) sodium dihydrogen phosphate b) sodium hydrogen phosphate

a) 1. Let’s write down the reaction of obtaining sodium dihydrogen phosphate:

NaOH + H3PO4 = NaH2PO4 + H2O;

2.determine the amount of sodium hydroxide:

n (NaOH) = n (H3PO4) = 4.8 mol.

b) 1. Let’s compose the equation for obtaining hydrogen phosphate:

2NaOH + H3PO4 = Na2HPO4 + 2H2O;

2. find the amount of hydroxide:

n (NaOH) = n (H3PO4) * 2 = 4.8 * 2 = 9.6 mol.

Answer: a) 4.8 mol; b) 9.6 mol.