Question

1) A 1.0 mL aliquot (sample) is taken from a 1.0L solution.Which of the following is/are true when comparing the 1.0 mLsolution to the 1.0L solution? Choose all that are true.

-The molarity of the 1.0 mL solution is less than the molarityof the 1.0L solution

-The molarity of each is the same

-The number of moles of solute in each solution is the same

-The number of moles of solute in the 1.0mL solution is lessthan the number of moles of solute in the 1.0 L solution

2) 5.00 mL is withdrawn from a 1.00L solution of NaCl anddiluted to 100.00 mL. If the concentration of the NaCl in the100.00 mL solution is 0.033, what is the concentration of NaCl inthe original 1.00 L solution?

3) What is used as a blank (reference/zero absorbance) for theanalysis of the samples in the spectrophotometer?

-Deioniozed water

- Nothing-air

-Acetylsalicylic acid standard solution

- Iron(III) chloride solution

4) The acetylsalycylic acid - iron (III) complex appears violetin color. What color of light is used to measure the absorbance ofthe solution?

- red

- orange

- green

- blue

- violet

5) A calibration curve for absorbance versus the concentrationof the chemical indicator crystal violet is found to have a slopeof 48. If a sample of unknown concentration has an absorbance of1.38, what is the concentration in the unknown sample?