A) A burette is a device used to deliver a variable but precisely known volume d

Question

A) A burette is a device used to deliver a variable but precisely known volume during, for example, a titration (refer to p. xviii a more detailed description). A volume measurement using a burette is performed in duplicate giving the following data. Complete the table by inserting the reading uncertainties from the table on p. xv, and calculating the total volume and its uncertainty. Calculate the average volume of the two runs and propagate the uncertainty to the average. Report the an absolute uncertainty. Show your work. A weighing boat was weighed on analytical balance by first taring the balance the weighing boat the boat to give a reading of 0.5132g. A quantity of sodium chloride was placed in and then reweighed to give a reading of sodium was a volumetric flask and made up to the mark with water. Report the concentration and uncertainty in g/L the resulting sodium chloride solution. Show your work.

Explanation / Answer

4a) You need to realize that the uncertainty in measurement is a property of the glassware and not of the measurement. Hence, the uncertainty will not add up, rather it stays the same, i.e, the uncertainty in the measurement of the volume = 0.02 mL.

4b) Average volume of the two runs = ½*(19.69 + 19.75) mL = 19.72 mL (ans).

Absolute uncertainty in measurement = (0.02 mL)/(19.72 mL) = 0.001 (ans).

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