Vet Labs Sat 2 Rev Flashcards
78%
Differentiate between precision and accuracy
Accuracy refers to how close a measurement is to the true or accepted value. Precision refers to how close measurements of the same item are to each other
Comprehend the significance of significant figures in reporting measurement results.
By using significant figures, we can show how precise a number is.
Determine the number of significant figures in a measurement.
- 0.00721800
- 1690020.00
Provide an example of how to improve the repeatability of a measurement.
- Properly Label Everything.
- Avoid Expired Reagents or Perform
Quality Control Tests. - Design Your Experimental Protocols
in Detail. - Include Appropriate Controls and
Practices. - Assign Work Appropriately.
Understand the concept of measurement error.
refers to the difference between the observed value (the result of measurement) and the actual value of what we are measuring.
List and know the seven base units of the International System of Units (SI).
- Length - meter (m)
- Time - second (s)
- Amount of substance - mole (mole)
- Electric current - ampere (A)
- Temperature - kelvin (K)
- Luminous intensity - candela (cd)
- Mass - kilogram (kg)
Convert measurements between different units (e.g., kilometers to meters, milliliters to liters).
0.078km –> m
78000m –> km
782ml –> L
120L –> ml
Know the primary purpose of titration.
to determine the concentration of a substance by reacting that substance with another substance of known concentration in a reaction.
The process of performing titration
Endpoint
The point during a titration when an indicator shows that the amount of reactant necessary for a complete reaction has been added to a solution.
Importance of Endpoint
Allows researchers to obtain the precise measurement of the analyte concentrations in solution
Define repeatability in the context of laboratory measurements.
A measure of the ability of the method to generate similar results for multiple preparations of the same sample.
Describe the purpose of performing tests in a laboratory setting.
The purpose of performing tests in a laboratory setting is to ensure the results are accurate, there is no contamination between chemicals and all possible risks are minimised (PPE)
How does titration help in determining the concentration of an unknown solution?
Titration helps in determining the concentration of an unknown solution by adding the titrant (known solution) placed in the buret to a known quantity of the analyte (the unknown solution) until the reaction is complete. Knowing the volume of titrant added allows the determination of the concentration of the unknown.
Explain the role of an indicator in a titration process.
To identify the equivalence or the end point of a reaction where pH change occurs.