Question

-Titration of asprin Lab

-end point= point at which the indicator changes color

-Base NaOH, Acid is Asprin, " you will place a sample of aspirin in a flask ad titrate the sample with Base NaOH."

(question) if you went past the end point before recording the final volume of NaOH, how would that affect the determined mass of aspirin ?

Answer 1

Moles of NaOH = Volume of NaOH x Molarity of NaOH

Since the you went past the end point, you get the higher value for volume. So, you get higher value for moles of NaOH.

Moles of acid (aspirin) = mole base (NaOH).

Since you use higher value for NaOH , you get the higher value for the moles of acid.

Mass of acid = moles of acid x molar mass of acid.

Since you used higher value for the moles of acid, you get the higher value for mass.

Thereofore, if you went past the end point before recording the final volume of NaOH, the determined mass value of aspirin is high.