Title: E2 Quiz
Course: Lab Instruments I > Section: E2: Meetings 2,3

This quiz covers the objectives for Experiment Set 2: Gravimetric Analysis.

Have a periodic table or list of elemental formula (molar) mases available before beginning.

Q: What is the primary measurement involved in gravimetric analysis?
- concentration
- density
- mass
- volume
A: mass

Q: Which one of the following lists the basic steps of gravimetric analysis in order?
- isolate analyte, weight sample, weigh analyte
- isolate analyte, weigh analyte, weigh sample
- weigh sample, weigh analyte, isolate analyte
- weigh sample, isolate analyte, weigh analyte
A: weigh sample, isolate analyte, weigh analyte

Q: Which one of the following would warrant use of an analytical balance?
- The weight will be used to determine the identity of an analyte.
- The weight will be used to make 2.0 M NaOH used in the analysis.
- The weight will be used to determine the quantity of analyte to three significant figures.
- The weight will be used to make the reagent that is used in excess to react with the analyte.
A: The weight will be used to determine the quantity of analyte to three significant figures.

Q: Choose TWO of the following that are examples of a chemical separation strategy.
- Crystallization
- Evaporation
- Filtration
- Precipitation
- Volatilization
A: Precipitation; Volatilization

Q: In a loss on ignition analysis, the analyte weight is measured as the sample weight ______ after heating and in a residue on ignition analysis, the analyte weight is measured in terms of the sample weight ______ after heating.
- lost; lost
- lost; remaining
- remaining; lost
- remaining; remaining
A: lost; remaining

Q: To what does “constant mass” refer?
- Using the same sample weight for each analytical trial.
- Obtaining the same weight of a sample after successive rounds of drying.
- Combining equal weights of selective samples to create a composite sample.
- Achieving consistent weight measurements for an analyte from different samples.
A: Obtaining the same weight of a sample after successive rounds of drying.

Q: What is the term used to express that every bit of a sample should be transferred from one container to another?
- constant transfer
- consistent transfer
- qualitative transfer
- quantitative transfer
A: quantitative transfer

Q: Which of the following is used to remove small amounts of water from a sample?
- Distillation
- Drying oven
- Dessicator with dessicant
- Disposable micropipette
A: Dessicator with dessicant

Q: Based on the data from an experiment below, what is the percent loss on drying?

Weight of empty, dried crucible: 8.2215 g

Weight of crucible + sample before drying: 12.5521 g

Weight of crucible + sample after drying: 11.0012 g
- 18.864%
- 35.813%
- 55.794%
- 54.187%
A: 35.813%

Q: Gravimetric analysis for the presence of calcium chloride in a 1.2442 g sample mixture was determined using precipitation as silver chloride. What is the weight of CaCl_2 present in the sample mixture if 0.5292 g AgCl were isolated?
- 0.2049 g
- 0.4098 g
- 0.6834 g
- 0.8196 g
A: 0.2049 g