Your lab group forgot to record the initial volume measurement on the buret and assumed later that it started at 0.00 mL when th

Question

3 years ago

5

Your lab group forgot to record the initial volume measurement on the buret and assumed later that it started at 0.00 mL when th

e actual starting buret reading was 2.00 mL. Would your final calculated molarity of the unknown acid be higher, lower or equal to the actual concentration

Chemistry

1 answer:

kherson [118] · Answer 1 · 2022-07-02T09:59:14+03:00

Answer:

Calculated molarity of acid is higher than the actual concentration.

Explanation:

For an acid-base titration, the following equation is obeyed for calculation-

$C_{acid}.V_{acid}=C_{base}.V_{base}$

where, C represents concentration and V represents volume.

So, $C_{acid}=\frac{C_{base}.V_{base}}{V_{acid}}$

Here, $C_{base}$ and $V_{acid}$ are constants.

Actual volume of base added from burette is lesser than the volume used (based on assumption) for calculation of concentration of acid.

So, actual value of $V_{base}$ is lesser. Hence calculated concentration or molarity of acid is higher than the actual concentration.