It takes 26.8 mL of a 0.0700 M NaOH standard solution to neutralize a 250 mL sample of lactic acid (C3H6O3). What mass of lactic

Question

4 years ago

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acid was dissolved in the sample?

1 answer:

makkiz [27] · Answer 1 · 2021-12-03T13:19:43+03:00

The complete balanced chemical reaction for this would be:

So we see that exactly 1 mole of NaOH reacts with 1 mole of lactic acid.

Calculate moles of NaOH.

moles NaOH = 0.07 moles/L * 0.0268 L

moles NaOH = 1.876 x 10^-3 mol

So,

moles C3H6O3 = 1.876 x 10^-3 mol

The molar mass of lactic acid is 90.08 g/mol so the mass is:

mass C3H6O3 = (1.876 x 10^-3 mol) * 90.08 g/mol