Ch 23
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What refers to a measurement an actual value of a sample with a limited deviation?
Accuracy
What is an example of an accurate measurement?
A sample weighing one gram plus or minus 0.001 gram
What is the repeatability of a set of measurements on the same sample?
Precision
What is an example of a precision measurement?
Measuring the same 1 gram sample thrice
Test tubes are small and allow for a
Number of samples to be arrayed in a rack
Round-bottom flasks are used for
Reaction, heating, or vacuum applications
What is a retort
A round vacuum flask with a long neck that extends to the side
Retorts are used for
Distillation, and are placed on a ring stand
An extraction flask, or a separatory funnel, is a
Teardrop-shaped flask with a ground glass stopper at the top and stopcock at the bottom
Bell jars contain
Vacuums
Calibrated glassware is used for any measurement that requires
Accuracy and precision
What is good to use for simultaneously heating and distilling a reaction mixture?
A round-bottom flask, for the round shape gives it extra strength to withstand heat and vacuum.
What is the difference between a volumetric flask and pipet?
The flask is designed to hold an amount, but not transfer it.
What is the appropriate glassware for titration?
A buret
What is the best glassware to use if a scientist needs to test 20 samples?
Test tubes
What is accurate in checking pH, Litmus or a pH meter?
A pH meter
What is best for both accuracy and precision?
The three-point calibration test
A scientist wants to make a solution of a 1.00 molal solution of sodium chloride in water. What should be used to measure the water added to the solution?
A balance, for the solvent is measured by weight rather than volume. Molal is moles solute / kg solvent
What combination is most suitable for titrating and measuring pH of a solution with endpoint pH 4.4?
A buret (titration), beaker, and litmus paper