Concentration and Neutralisation

Question 1

What is the concentration of a solution?

Answer 1

Number of moles of a substance per decimetre cubed of water

A decimetre cubed is equivalent to one litre.

Question 2

What is the formula relating concentration, number of moles, and volume?

Answer 2

C = n / V

Where C = concentration, n = number of moles, and V = volume.

Question 3

What is a standard solution?

Answer 3

A solution prepared to a very high level of accuracy

Standard solutions are made using a volumetric flask.

Question 4

What is a volumetric flask used for?

Answer 4

Preparing standard solutions

It has a single, very thin calibration line to display a fixed volume.

Question 5

In the context of neutralisation, what is volumetric titration?

Answer 5

A technique to find the concentration of an unknown solution

It uses a standard solution to neutralise another solution.

Question 6

True or false: It takes one mole of acidic molecules to neutralise one mole of basic molecules.

Answer 6

TRUE

This principle is fundamental in volumetric titration.

Question 7

What is the end point in a titration?

Answer 7

The point at which neutralisation happens

An indicator is used to determine this point.

Question 8

What is the volume occupied by one mole of gas at room temperature and pressure (RTP)?

Answer 8

24 decimetres cubed

This is the standard volume for gases at RTP.

Question 9

What are the conditions for room temperature in the context of gas volume?

Answer 9

Approximately 20-25 degrees Celsius

The pressure used is 1 atmosphere, equivalent to 101.3 kPa.

Question 10

Fill in the blank: A standard solution can be used to find the concentration of another unknown solution using a technique called _______.

Answer 10

volumetric titration

This technique involves neutralisation reactions.