Homework Answers
Molecular equation for the neutralization reaction;
2NaOH(aq) + C4H6O5(aq) >>>>> Na2C4H4O5(aq) + 2H20 (l)
2 moles of NaOH are required for neutralization of 1 mole of malic acid .
Apply concentration equation at equivalence point ;
2(M1V1) of NaOH = M2V2 of malic acid
2(0.1000M × 12.54mL) = M2 × 24.68mL
M2 = 2.508/24.68 = 0.102 M malic acid .
Concentration of malic acid in moles/L = 0.102 M
Concentration in g/L = (0.102moles × 134.09g/mol)/litre = 13.68 g/L
THUS malic acid concentration of apple juice is 13.68 g/L .
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