⟶Na2HPO3+2H2O Millimoles of H3PO3=M×V=1×50=50 For 1 millimole of H3PO3, we require 2 millimoles of NaOH. For 50 millimole of H3PO3, we require (2×50)=100 millimoles of NaOH. Millimoles of NaOH=M×V=100 1×V=100 V=100mL
H3PO2
100mL
2M
+
NaOH
1M
V=?
→NaH2PO2+H2O Millimoles of H3PO2=M×V=2×100=200 For 1 millimole of H3PO2, we require 1 millimoles of NaOH. For 200 millimole of H3PO2, we require 200 millimoles of NaOH. So, volume of NaOH=200mL