%3Cp%3EA%20solid%26nbsp%3Bmaterial%26nbsp%3Bis%26nbsp%3Bknown%26nbsp%3Bto%26nbsp

Question

%3Cp%3EA%20solid%26nbsp%3Bmaterial%26nbsp%3Bis%26nbsp%3Bknown%26nbsp%3Bto%26nbsp%3Bcontain%26nbsp%3Boxalic%26nbsp%3Bacid%2C%26nbsp%3BH2C2O4%2C%26nbsp%3Band%26nbsp%3Bother%26nbsp%3Binert%26nbsp%3Bmaterials.%26nbsp%3BA%26nbsp%3B%26nbsp%3B1.450%26nbsp%3Bgram%26nbsp%3Bsample%26nbsp%3Bof%26nbsp%3Bthis%26nbsp%3Bmaterial%26nbsp%3Bis%26nbsp%3Bdissolved%26nbsp%3Bin%26nbsp%3B100mL%26nbsp%3Bwater%26nbsp%3Band%26nbsp%3Btitrated%26nbsp%3Bwith%26nbsp%3B.0903%26nbsp%3BM%26nbsp%3Bpotassium%26nbsp%3Bhydroxide.%26nbsp%3BIt%26nbsp%3Btakes%26nbsp%3B22.50%26nbsp%3BmL%26nbsp%3Bof%26nbsp%3BKOH%26nbsp%3Bsolution%26nbsp%3Bto%26nbsp%3Breach%26nbsp%3Bthe%26nbsp%3Bend%26nbsp%3Bpoint.%26nbsp%3BWhat%26nbsp%3Bpercent%26nbsp%3B(by%26nbsp%3Bmass)%26nbsp%3Bof%26nbsp%3Bthe%26nbsp%3Bsolid%26nbsp%3Bmaterial%26nbsp%3Bis%26nbsp%3Boxalic%26nbsp%3Bacid%3F%3C%2Fp%3E

Explanation / Answer

e.g

moles KOH = 0.02378 L x 0.1255 M=0.002984
H2C2O4 + 2 NaOH = Na2C2O4 + 2 H2O
moles oxalic acid = 0.002984/2=0.001492
mass oxalic acid = 0.001492 x 90.038 g/mol=0.1343 g

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