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2) 5.00 mL is withdrawn from a 1.00L solution of NaCl anddiluted to 100.00 mL.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?
