Question

10T 6,50 An aqueous solution containing 10.0 g NaOH is added to an aqueous solution containing 10.0 g H3PO4. (a) Write a balanced equation for the acid-base reaction that should occur. (b) Identify the limiting reactant. (c) Will the solution be acidic or basic when the reaction is complete?

Answer 1

10 gm of NaOH is added to 10 gm of H₂PO4. We know that NaOH is a strong base and H₂PO4 is a weak acid. a) The balanced Chemical reaction is H₂PO4 + 3NaOH → Na₂PO4 + 3H₂O This is the complete balanced equation. for this acid base reaction! 6 we know that molecular mass of NaOH = 40 gr/mot 10 gm of Naoth a mot = 0. 25 mol molecular mass of H₂PO4 = 98 gm /mol :.. 10 gm of H₂PO4 = 1 mol = 0.102 mol. for complete neutralisation of I mot of H₂PO4 , 3 mol of NaoH is required.