Question: Oxalic acid (COOH) 2 is used to remove the rust stains and some ink st

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Question:
Oxalic acid (COOH)2is used to remove the rust stains and some ink stains from fabrics.A 0.1743g sample of impure oxalic acid is required and 39.8 mL of0.08915M NaOH solution for complete neutralization. No acidicimpurities were present. Calculate the percentage purity ofthe (COOH)2. Question:
Oxalic acid (COOH)2is used to remove the rust stains and some ink stains from fabrics.A 0.1743g sample of impure oxalic acid is required and 39.8 mL of0.08915M NaOH solution for complete neutralization. No acidicimpurities were present. Calculate the percentage purity ofthe (COOH)2.

Explanation / Answer

Oxalic acid and NaOH reacts in 2: 1 ratio. So weight of oxalic acid present in the 0.1743gsample = 2 x moles of NaOH x molar mass of oxalic acid                                                                                    = 2x (39.8mL x 0.0891mol/L)x 90.03g/mol                                                                                    = 638.53 mg                                                                                     =0.63853g Here the calculated weight of oxalic acid present in theimpure sample is greaer than the weight of ompure sample whichsenses that the given data is inadequate.

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