Answer to Question #147767 in Chemistry for Aisha

Question

H2C2O4.2H2O(s) is a primary standard substance. 2.3688 g of oxalic acid dihydrate were completely neutralized by 42.56 ml of NaOH solution. Calculate the molar concentration of the NaOH solution.

Answer 1

H2C2O4.2H2O(s) same as H6C2O6

H6C2O6(s) + 2NaOH(aq)--> 4H2O + Na2C2O4(aq)

Moles of NaOH:

(2.3688 g H6C2O6)*

(1mol H6C2O6/126.064 g H6C2O6)*(2 mol NaOH/1 mol H6C2O6)

=0.37581 mol NaOH

Liters of NaOH:

42.56 ml = 0.04256 L

NaOH (molar concentration)

0.37581 mol NaOH/0.4256 L NaOH

=8.830M