Question 1)You wish to prepare 100 mL of 0.600 M HCl from concentrated HCl (11.6

Question

Question 1)You wish to prepare 100 mL of 0.600 M HCl from concentrated HCl (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 HCl to have the correct number of moles to give the 0.600 M solution when dispensed into the volumetric flask?

Select one:

a. 0.30 mL

b. You cannot prepare the 0.600 M solution with this flask and pipet.

c. 5.15 mL

d. 4.85 mL

e. 9.70 mL

Question 2) You wish to prepare 100 mL of a 0.0125 M solution by dilution of a 0.125 M solution. Which single pipet could you use to make this solution?

Select one:

a. 5 mL volumetric pipet

b. 1 mL volmetric pipet

c. 10 mL volumetric pipet

d. 25 mL volumetric pipet

e. 50 mL volumetric pipet

Explanation / Answer

Answer for question 1

The relation used for this type of problems is

M1 * V1 = M2 * V2

M1 = molarity of compound 1 ie HCl

V1 = volume of compound one taken

M2 = molarity of compound 2

V2 = volume of compound 2

11.65 * V1 = 0.6 * 100ml

V1 = 5.15mL

As pippet is graduated 0.00 from the top, fill the HCl upto 0.00 and dispense it upto 5.15 mL.

Option (C) is correct.

Answer for question 2

M1 * V1 = M2 * V2

0.125 M * V1 = 0.0125M * 100mL

= 10 mL

Option (C) is correct.

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