Clean the cuvettes, burets, and llU We ca NaO conc meas PRELAB QUESTIONS (RESPON

Question

Clean the cuvettes, burets, and llU We ca NaO conc meas PRELAB QUESTIONS (RESPOND ON A SEPARATE SHEET OF PAPER): soheriom gecord your work and answer in the notebook as well (you will need it to run y Caleulate the mass of CuSo,SH-O required for preparation of 100 mL of 0.010 M C experiment) in Define Amax and explain why it is desirable to do the experimental procedure determination of concentration of Cu solution at homas. a sli Pro 2 3. The calibration curve, absorbance (A) versus copper concentration (c), should be a straight What is the expected line. Briefly explain why (look at the equations listed above). absorbance for the solution in test tube "1 Set ml be th Calculate the absorbance, A, when %7-20%, %-50%, and %T 80%. Be sure to get the report from the course website and complete all sections. Attach the required graphs.

Explanation / Answer

Answer:

CuSO4.5H2O gives Cu2+ ions in solution.

We suppose to prepare 100.0 mL i.e. 0.1 L of 0.01 M Cu2+ solution.

# of Moles of Cu2+ ions = Molarity * Volume in L = 0.01 * 0.1 = 0.001 Moles.

0.001 Moles Cu2+ = 0.001 Moles CuSO4 5H2O.

Now, Molar Mass of CuSO4 5H2O = 249.69 g/mole.

I.e. 1 mole of CuSO4 5H2O. = 249.69 g

SO, 0.001 mole CuSO4 5H2O. = 0.24969 g = 0.250 g (apprx) .......(dividing throughout by 1000)

0.250 g CuSO4 5H2O is required to prepare 100.0 mL of 0.01 M CuSO4 5H2O solution.

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