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Year 10 - Science

Adapting a multistep chemical procedure for making a pure dry salt

Making salts

Unit Summary

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.

Lesson Summary

You will learn to describe and explain adaptations to a multistage chemical procedure to alter or improve the quality of the product.

Key Notes

  • Gently heating the acid speeds up the reaction, ensuring all acid reacts.
  • The salt should be dried using an appropriate method (using filter paper, or in the oven).
  • A pure sample should be prepared with equipment washed with distilled water to avoid contamination.
  • Reacting a metal hydroxide with an acid also produces a salt and water.
  • Reacting a metal carbonate with an acid can produce a desired salt with water, as well as carbon dioxide gas.

Vocabulary To Learn

  • method: Describes how an experiment is carried out; it is a step-by-step procedure.
  • apparatus: A piece of equipment that is designed for a particular use.
  • evaluate: To evaluate something is to make a judgement about it with respect to a particular purpose.
  • adapt: To make suitable for use or purpose, e.g. equipment or steps in an experimental procedure.

Common Mistakes To Avoid

  • Pupils can sometimes mistake the excess base for the salt formed as it is a solid.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Gently heating the acid speeds up the reaction, ensuring all acid reacts. The salt should be dried using an appropriate method (using filter paper, or in the oven).

2. Define this scientific word and use it in context. 'method'

Describes how an experiment is carried out; it is a step-by-step procedure. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils can sometimes mistake the excess base for the salt formed as it is a solid. Correction: Emphasise at the beginning of the experiment what soluble means and that the salt will be initially obtained dissolved in water.

More Lessons In This Unit

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