Malonic acid is a diprotic acid used in the production of pharmaceuticals. A 0.6

Question

Malonic acid is a diprotic acid used in the production of pharmaceuticals. A 0.6561 g sample of a m ixture of malonic acid (C3H4O4) and NaCl was titrated to the equivalence point with NaOH. The titration required 54.94 mL of 0.1009 M NaOH. Malonic acid is a diprotic acid.
A. Write a balanced equation for the reaction.
B. Whi isn't NaCl showin in the balanced equation above?
C. How many moles of C3H4O4 were titrated?
D. What was the original mass of C3H4O4 in the sample?
E. What perecent of the sample was C3H4O4?

Explanation / Answer

Supposing C3H4O4 to be malonic acid: C3H4O4 + 2 NaOH ? C3H2O4Na2 + 2 H2O NaCl isn't shown because it doesn't participate in the reaction. (0.05494 L) x (0.1009 mol/L) x (1/2) = 0.002772 mol C3H4O4 (0.002772 mol C3H4O4) x (104.0618 g C3H4O4/mol) = 0.2885 g C3H4O4 (0.2885 g) / (0.6561 g) = 0.4397 = 43.97% C3H4O4

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