H Chem: Chemical Analysis

Front

What is chromatography?

Back

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

Front

How can the identity of a component be indicated in chromatography?

Back

By the distance it has travelled or by the retention time it has taken to travel through the apparatus.

Front

What does a graphical result of a chromatography experiment show?

Back

An indication of the quantity of substance present on the y-axis and retention time on the x-axis.

Front

What is volumetric analysis?

Back

It involves using a solution of accurately known concentration in a quantitative reaction to determine the concentration of another substance.

Front

What is titration used for?

Back

To determine, accurately, the volumes of solution required to reach the end-point of a chemical reaction.

Front

What is a standard solution?

Back

A solution of accurately known concentration.

Front

What are concordant titre volumes?

Back

Titre volumes within 0.2 cm3 are considered concordant.

Front

What are redox titrations based on?

Back

Redox reactions.

Front

Why is an indicator not required in titrations using acidified permanganate?

Back

Because purple permanganate solution turns colourless when reduced.

Front

How can the concentration of one reactant be calculated in a titration?

Back

Given the concentration of the other reactant and the volumes of both solutions.