You wish to prepare 100 mL of 0.750 M HCI from concentrated HCI (11.65 M). You a

Question

You wish to prepare 100 mL of 0.750 M HCI from concentrated HCI (11.65 M). You are provided with a 100 mL volumetric flask and a 10 mL graduated pipet with 0.00 line at the top and calibration lines each 0.1 mL. When filled to the 0.00 mL line this pipet would dispense 10.00 mL of solution when drained leaving only the final inside drop. At what volume reading on the pipet should you start dispensing the 11.65 M HCI to have the correct number of moles to give the 0.750 M solution when dispensed into the volumetric flask? Select one: O a. 7.12 mL b, 2.88 mL c. You cannot prepare the 0.750 M solution with this flask and pipet. d. 3.56 mL e. 6.44 ml age Next page Predicting Conductivi ppsx . Show All × Dll F6 5 6 8 0 0

Explanation / Answer

A. From relative equation of normality and volume

The amount of HCl needed is 6.437 mL.

From the present scale of calibration in pipette, it is not possible to prepare exact solution of 0.75 M.

B. Considering the molar values to be molar conductivity.

we have following relations; a+c=8.45 ; b+d=4.21 ; c+d=7.25

Hence (a+c)-(c+d)+(b+d) = a+b = 8.45 -7.25 + 4.21 = 5.41mS

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