Please help with questions B and C A 50.00 mL aliquot of Cu+(aq) was titrated wi
ID: 561017 • Letter: P
Question
Please help with questions B and C
A 50.00 mL aliquot of Cu+(aq) was titrated with 0.049 M EDTA, and the absorbance was monitored. Answer the following questions based on the spectrophotometric titration curve below. The equation of the best-fit line prior to the end point point is f(x)-0.05055e-2.600 × 10-3 The equation of the best-fit line after to the end point is f(x)-2.900 x 10-3z + 0.3880 Titration Curve of Cu-EDTA 90.5 0.4 0.3 0.2- ai 0.1 24 6 8 10 12 14 16 18 20 Volume of EDTA (mL) (a) Determine the end point volume for this titration. 8.20 mL EDTA (b) Determine the mass of copper (in mg) in the 50.00 mL aliquot that was titrated. mg Cu (c) If the total volume of the unknown solution was 250.00 mL, what is the mass (in mg) of copper in the entire solution?Explanation / Answer
Given the end point volume for the titration is 8.2 mL. (As part A)
(B)
Numberof mmoles of copper in 50 mL of solution.
=(0.049*8.2)
=0.4018 mmol
(C)
Molarmass of Cu is 63.5 g/mol
Mass of copper in 50 mL of aliquot.
=63.5*0.4018
=25.51 mg
Mass of copper in entire solution.
=(250/50)*25.51
=127.57 mg