ew.php?id 3202980 210/2017 11:ss PM 778/100 G 2/10/2017 ossoM PM Grade Print Cal
ID: 482041 • Letter: E
Question
ew.php?id 3202980 210/2017 11:ss PM 778/100 G 2/10/2017 ossoM PM Grade Print Calculator Periodic Table uestion 8 of 9 Sapling Learning The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initial volume of 49.61 t 0.04 mL was delivered, the buret was refilled, and an additional 1.42 t 0.04 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.58 t 0.04 mL. Calculate the endpoint volume corrected for the blank and its absolute uncertainty. Note: Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of t 0.09 mL 50.25 mL. your calculations. There is a hint available!Explanation / Answer
Given-
Initial volume of 49.61 ± 0.04 ml
Burette was refilled, and an additional 1.42 ± 0.04 ml
The titration of a blank solution without the analyte required 0.58 ± 0.04 ml
To do this, set up the equation as follows [49.61(± 0.04) + 1.42( ± 0.04)] - 0.58( ±0.04)
49.61 + 1.42 = 51.03 -0.58 = 50.45 ml (4 sig figs)
Finally: Square root of (0.04)^2 +(0.04)^2 + (0.04)^2 = 0.069 ml (two sig fig)
50.45 ml (4 sig figs) ± 0.069 ml (two sig fig)
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