The total volume required to reach the endpoint of a titration required more than the 50 mL50 mL total volume of the buret. An initial volume of 49.37±0.06 mL49.37±0.06 mL was delivered, the buret was refilled, and an additional 1.34±0.05 mL1.34±0.05 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.51±0.04 mL0.51±0.04 mL . Calculate the endpoint volume corrected for the blank and its absolute uncertainty.

The volume of titrant consumed at the equivalence point is the sum of the total volume consumed. In this case, is the sum of 49.37±0.06 mL and 1.34±0.05 mL. Also, it is important to subtract the blank volume to the total titrant volume to correct this. Thus,

V = (49.37±0.06 mL + 1.34±0.05 mL) - 0.51±0.04 mL

The volume values are added and subtracted normally, but the errors are added to obtain the absolute uncertainty:

V = ((49.37 + 1.34 - 0.51) ± (0.06 + 0.05 + 0.04) )mL

V = 51.22±0.15mL