Substance formed when a solute dissolves into a solvent.

A substance that has dissolved into a solvent.

The amount of a solute dissolved in a certain volume of solvent.

A low concentration of a solute in a solution.

6.02 × 10²³ of something. The mass of a mole of a substance is its relative mass expressed in grams.

Concentration of solutions: using moles

Chemistry

In the Electrolysis unit, pupils will build on their understanding of chemical reactions to explore the process of electrolysis and its applications.

In the Acids and Bases unit, pupils learned about the properties of acids, bases, and alkalis, and the reactions between them to form salts and water.

This unit explores empirical formulae, balanced chemical and ionic equations, gas identification, acid reactions, and pH as a measure of hydrogen ion concentration. It covers separation techniques and focuses on planning experiments, accurate measurements, safety, and communicating findings.

Making salts

Physical activity and equipment requiring safe use

How many cm³ are there in 3 dm³ of solution?

It is the mass of solute dissolved in 1 dm³ of water, in g/dm³.

It is the mass of solute dissolved in 1 dm³ of water, in dm³/g.

It is the mass of solvent dissolved in 1 dm³ of water, in g/dm³.

It is the mass of solvent dissolved in 1 dm³ of water, in dm³/g.

Which of the following statements correctly describes the concentration of an aqueous solution?

What is the mass of one mole of sodium chloride (NaCl)? Sodium has a relative atomic mass of 23; chlorine has a relative atomic mass of 35.5.

What is the mass of solute in a 1 dm³ solution with a concentration of 15 g/dm³?

The NaCl solution contains more solute particles than the KCl solution.

The KCl solution contains more solute particles than the NaCl solution.

Both solutions contain an equal number of solute particles.

The number of solute particles depends on type of solute, not the concentration.

Two 500 cm³ solutions of NaCl and KCl both have a concentration of 1 mol/dm³. Which of the following statements is true?

If the concentration of a solution is 2 mol/dm³, how many moles of solute are there in 500 cm³ of solution?

a substance formed when a solute dissolves into a solvent

a substance that has dissolved into a solvent

a substance into which a solute dissolves

Match each keyword to the correct definition.

Solution 1 contains 20 g of solute dissolved in 500 cm³ of water.

Solution 2 contains 15 g of solute dissolved in 500 cm³ of water.

Solution 3 contains 5 g of solute dissolved in 500 cm³ of water.

Solution 4 contains 1 g of solute dissolved in 500 cm³ of water.

Solution 5 contains 0.5 g of solute dissolved in 500 cm³ of water.

Which solution will have the highest concentration?

Solution A has a concentration of 0.02 g/dm³.

Solution C has a concentration of 0.5 g/dm³.

Solution D has a concentration of 1 g/dm³.

Solution B has a concentration of 20 g/dm³.

Put these solutions in order from the least to the most concentrated.

Which equation correctly links mass, relative mass and moles?

What is the concentration of an aqueous solution if 20 g of solute is dissolved in 2 dm³ of water?

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet