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An impure sample of (COOH)2 · 2 H2O that has a mass of 2.9 g was dissolved in water and titrated with standard NaOH solution. T...Asked by Big Boy
An impure sample of (COOH)2 · 2 H2O that has a mass of 4.3 g was dissolved in water and titrated with standard NaOH solution. The titration required 44.5 mL of 0.11 mo- lar NaOH solution. Calculate the percent (COOH)2 · 2 H2O in the sample.
Answer in units of %.
Answer in units of %.
Answers
Answered by
DrBob222
H2C2O4.2H2O + 2NaOH ==>Na2C2O4 + 4H2O
mols NaOH = M x L = 0.11 x 0.0445 = ?
mols H2C2O4.2H2O used = 1/ 2 x mols NaOH = ? (note that 2 mols NaOH = 1 mol H2C2O4.2H2O)
grams H2C2O4.2H2O in sample = mols H2C2O4.2H2O x molar mass = ?
% H2C2O4.2H2O = (grams H2C2O4.2H2O/4.3 g)*100 = ?
Post your work if you get stuck.
mols NaOH = M x L = 0.11 x 0.0445 = ?
mols H2C2O4.2H2O used = 1/ 2 x mols NaOH = ? (note that 2 mols NaOH = 1 mol H2C2O4.2H2O)
grams H2C2O4.2H2O in sample = mols H2C2O4.2H2O x molar mass = ?
% H2C2O4.2H2O = (grams H2C2O4.2H2O/4.3 g)*100 = ?
Post your work if you get stuck.
Answered by
Big Boy
Perfect, thank you for your help, DrBob222!
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