CH106 Analytical Chemistry Flashcards
What is qualitative analysis?
This identifies which compounds are present in a sample.
What is quantitative analysis?
This measures the proportions of each compnent in a sample.
Define component
A chemical compound, ion or element. All components combined form the element being analysed.
Define sample
A smaller representative part of the material being analysed.
Define analyte
The particular component to be identified or measured.
Define interference
Any process or compnent that causes the answer from chemical analysis to be wrong.
Outline the typical process of chemical analysis.
- Take a sample.
- Prepare the sample (disolve/ dilute usually)
- Remove or compensate for interferences.
- Identify and/or measure the analyte.
- Calculate results.
What are the different types of chemical analysis?
Gravimetric
Titrimetric
Spectroscopic
Electrochemical
Radiochemical
What is gravimetric analysis?
Measures the mass of the analyte.
What is titrimetric (volumetric) analysis?
Measures the quantity of reagent that reacts with the analyte.
What is spectroscopic analysis?
Measures the intensity of electromagnetic radiation absorbed or emitted by the analyte.
What is electrochemical analysis?
Measures current, voltage or conductivity due to the analyte.
What is radiochemical analysis?
Measures the nuclear radiation emitted by the analyte.
What is accuracy?
The closeness of a measurement to the true result.
What is precision?
The closeness of multiple measurements to each other.
What is a titrant in a titration?
The reagent.
What is the the titrand in a titration?
The analyte.
What is the equivalence point of a titration?
The exact point in the reaction where the correct volume of titrant has been added to react with the titrand.