Question

2. it is important to make certain that there is no air bubble in the tip of the buret below the stopcock before the initial reading of the liquid level in the buret is taken. if a 0.5-ml air bubble is present in the tip of a buret, calculate what percent error in a 40-ml sample will result if the air bubble is dislodged during the dispensing of the sample?

Answer 1

To calculate the percent error, you need to know the volume of the air bubble and the volume of the sample being dispensed. In this case, the volume of the air bubble is 0.5 mL and the volume of the sample is 40 mL.

To find the percent error, you can use the following formula:

(Volume of air bubble / Total volume) x 100 = Percent error

Plugging in the values, we get:

(0.5 / 40) x 100 = 1.25%

So if a 0.5-mL air bubble is present in the tip of a buret and it is dislodged during the dispensing of a 40-mL sample, the percent error in the sample will be 1.25%. This means that the actual volume of the sample dispensed would be off by 1.25% of the intended volume.