A student is given a sample of CuSO4(s) that contains a solid impurity that is soluble and colorless. The student wants to determine the amount of CuSO4

in the sample and decides to use a spectrophotometer. First, the student prepares a calibration graph by measuring the absorbances of CuSO4(aq)

solutions of known concentrations. The graph is shown below.

(a) The student dissolves the entire impure sample of CuSO4(s)

in enough distilled water to make 100.mL

of solution. Then the student measures the absorbance of the solution and observes that it is 0.30

. Determine the concentration of CuSO4(aq)

in the solution.

(b) Calculate the number of moles of CuSO4

that were in the impure sample of CuSO4(s)

.

(c) In addition to the number of moles of CuSO4

calculated in part (b)

, what other quantity must be measured in order to calculate the mass percentage of CuSO4

in the impure sample of CuSO4(s)

?

d) A particulate drawing of a single Cu2+

ion is shown in the following box. Draw two H2O

molecules in the box to show the most likely orientation of H2O(l)

molecules around the Cu2+

ion.