3.5 Chemical Analysis

Question 1

Chromatography

Answer 1

Chromatography is a technique used to separate the components present within a mixture. Chromatography separates the substances by making use of differences in their polarity or molecular size

Question 2

Volumetric analysis

Answer 2

Volumetric analysis involves using a solution of accurately known concentration in a quantitive reaction to determine the concentration of another substance

Question 3

Titrations

Answer 3

Titration is used to determine, accurately, the volumes of solution required to reach the end-point of a chemical reaction. An indicator is normally used to show when the end-point is reached. Titre volumes within 0.2cm3 are considered concordant

Question 4

Standard solution

Answer 4

Solutions of accurately known concentration are known as standard solutions

Question 5

Redox titrations

Answer 5

Redox titrations are based on redox reactions. In titrations using acidified permanganate, an indicator is not required, as purple permanganate solution turns colourless when reduced