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Year 7

Saturated solutions

I can compare data involving the solubility of different solutes and use it to describe saturation.

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New
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Year 7

Saturated solutions

I can compare data involving the solubility of different solutes and use it to describe saturation.

Download all resources
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Share activities with pupils
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Lesson details

Key learning points

  1. At a given temperature, there is a limit to how much solute can dissolve in a solvent.
  2. Solutes may become insoluble as a solution cools.
  3. Lines of best fit can be used to predict unknowns values if one variable is known.
  4. Data from multiple investigations can be plotted on the same graph for ease of comparison.

Keywords

  • Saturated solution - A saturated solution is one in which no more solute can dissolve in the solvent at a given temperature.

  • Solubility - Solubility refers to how well a solute is able to dissolve in a solvent to create a solution.

  • Line of best fit - A line that depicts the trend of scattered data plots on a graph.

Common misconception

Pupils are reluctant/struggle to plot multiple sets of data on one graph.

Fold the table of results so pupils are only looking at one set of data at a time when plotting. Use different plot symbols/colours too.

Try a week-long practical whereby pupils create a saturated sugar solution and document how crystals grow as they make 'rock candy' on 'seeded' (i.e. dipped in sugar) string hanging in the saturated solution. Add food dyes for different colours.
Teacher tip

Content guidance

  • Risk assessment required - equipment

Supervision

Adult supervision required

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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Starter quiz

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6 Questions

Q1.
What happens to most solutes as the temperature of a solvent increases?
Correct answer: They dissolve more quickly.
They become insoluble.
Their mass increases.
They evaporate with the solvent.
Q2.
When drawing a graph in science, which of the following graphs have their variables plotted correctly?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q3.
What is typically used in science to predict values from a graph?
Correct answer: A line of best fit.
The axis labels.
The title of the graph.
The mean values before they're plotted.
A bar chart.
Q4.
Solubility is a description of how well a solvent can dissolve into a solute.
true
Correct answer: false
Q5.
What type of graph is most appropriate for showing the relationship between suggested variables? KEY: Independent variable (IV) | Dependent variable (DV)
Correct Answer:bar chart,IV: hair colour | DV: number of students

IV: hair colour | DV: number of students

Correct Answer:scatter chart,IV: mass of sugar | DV: time taken to dissolve

IV: mass of sugar | DV: time taken to dissolve

Correct Answer:table of results,IV: shoe size | DV: favourite food

IV: shoe size | DV: favourite food

Q6.
The term for the measure of how much a substance can dissolve in a given amount of solvent at a specific temperature is...
Correct Answer: solubility
Q2 image 1 UYSEG Q2 image 2 UYSEG Q2 image 3 UYSEG Q2 image 4 UYSEG

Exit quiz

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6 Questions

Q1.
What observation indicates that a solution has become saturated?
The solution becomes hot.
Correct answer: Undissolved solute remains.
The solvent changes colour.
The solution starts to bubble.
Q2.
A line of best fit on a solubility graph can be used to predict the solubility of a solute at temperatures not directly tested.
Correct answer: true
false
Q3.
When solutes become insoluble as a solution cools, it may lead to the formation of...
Correct Answer: crystals, crystal
Q4.
The process of a solute dissolving in a solvent until no more can dissolve at a particular temperature is known as reaching...
Correct Answer: saturation, saturation point
Q5.
Match the following key terms to their descriptions.
Correct Answer:Soluble,Describes something that can dissolve in a solvent.

Describes something that can dissolve in a solvent.

Correct Answer:Insoluble,Describes something that cannot dissolve in a solvent.

Describes something that cannot dissolve in a solvent.

Correct Answer:Saturated solution,A solution that cannot dissolve any more solute.

A solution that cannot dissolve any more solute.

Correct Answer:Solution,The mixture formed between solute and solvent.

The mixture formed between solute and solvent.

Correct Answer:Solubility,A measure of how well something dissolves.

A measure of how well something dissolves.

Correct Answer:Solute,A substance that can dissolve to form a solution.

A substance that can dissolve to form a solution.

Q6.
Use the graph to determine the mass (in grams) of sugar that will dissolve in 100 cm³ of water at 85℃. (Give the number to the nearest hundred).
An image in a quiz
Correct Answer: 400, 400g, 400 g, 400 grams
Q6 UYSEG