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20 Cards in this Set

  • Front
  • Back
a physical operation performed in comparison to a standard whose description must include a quantitative component
What is meant by "Characterizing a solution?"
describing a solution in terms of kinds of particle species present and amounts of species
What's the difference between a counter ion and a conjugate ion?
counter ion: DOES NOT have acid/base properties and is a spectator
conjugate: has acid/base properties
What is the most important property of a primary standard?
It's #mmols can be determined through a simple drying and weight operation.
When you measure "twenty-five" mL of water using a beaker, what value for volume do you write? Why?
25 mL
The smallest marked divisions on the beaker are the tens place. Uncertainty occurs in the "5" value.
When you measure "twenty-five" mL of water using a graduated cylinder, what value for volume do you write? Why?
25.0 mL
The smallest marked divisions on the graduated cylinder are the ones place. Uncertainty occurs in the tenths place.
When you measure "twenty-five" mL of water using a pipet, what value for volume do you write? Why?
25.00 mL
The pipet makes a high quality measurement that is to the hundredths place.
What do we mean by "quality of a measurement?"
Quality refers to the reproducibility or precision of a measurement.
What is the distinction between "raw" and processed" data?
raw data: directly generated measurements obtained in lab
processed data: involves mathematical manipulation of usually 2 or more raw measurments. Its quality cannot exceed that of the poorest associated raw measurement
What is the operating principle that governs how you write down a value for a piece of processed data?
The quality of processed data cannot be better than the quality of the poorest associated raw measurement.
A big deal was made about finding the range of the values that incorporated 95% of all values. What does identifying this range entitle you to state about the experimentally-determined density of water?
A confidence interval gives an estimated range of values which is likely to include the true value. By looking at the 95% confidence interval we can state how certain we are about how uncertain we are about the value of water. Small ranges are preferred because they are more certain.
How does the 95% range of mean density values compare to the 95% range for individual density values? What does this comparison suggest about how to make the most effective use of your measurement?
The range of the mean density values was smaller than that of the individual values. This suggests that using means would be more effective and get you a value closer to the true value.
What two properties does a primary standard have that allows it to be a primary standard?
1. It's #mmol can be determined by a simple drying and weighing operation.
2. It is extremely pure, stable, and undergoes one invariable reaction with the other reactant of interest
Your first lab experiment is known as a standardization. What is it exactly, you are trying to achieve?
We are trying to achieve the concentration of the titrant (OH-) to a high quality.
What problem forces you to have to take do a standardization before working on the unknown KHP sample?
We must know the concentration of the NaOH solution in order to determine the #mmoles of titrant need to reach the equivalence point. Because of a 1:1 relationship between the titrant (OH-) and the analyte (HP-) we will then be able to determine the %KHP.
The species being analyzed whose abundance is yet to be determined.
The species being added in a controlled fashion that specifically reacts with the analyte by means of a major reaction.
primary standard
A species whose #mmol can be determined to a high quality by a simple drying and weighing operation
equivalence point
The point where both the analyte and titrant are limiting reagents.
A controlled major reaction between a titrant and an analyte in which the idea is to reach the equivalence point.