Chemistry 1LC Practical Practice Test

Which of the following reflects the precision of a buret reading?

0.1 mL 0.5 mL 0.05 mL 0.01 mL

Correct Answer:

0.01 mL

Explanation:

The precision of a buret reading comes from estimating the volume to one more decimal place than the smallest mark on the instrument. A typical buret has marks every 0.1 mL, but you read the bottom of the meniscus and estimate to the nearest 0.01 mL. This allows you to report measurements with two digits after the decimal, reflecting a hundredth-of-a-milliliter precision. So the most precise reading you can typically claim from a buret is 0.01 mL. Readings that only go to 0.1 mL or 0.5 mL are coarser and don’t take advantage of the interpolated estimation between marks.

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