Making Salts
A salt is a chemical compound formed from the reaction of an acid with a base. There are several methods for making salts, depending on whether the salt is soluble or insoluble and the nature of the reactants. Common methods include reacting an acid with a metal, an insoluble base, or a carbonate.
Full topic guide: the detailed syllabus page with worked examples and common mistakes lives at studyvector.co.uk/gcse/chemistry/chemical-changes/making-salts.
Topic preview: Making Salts
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Topic explanation
A salt is a chemical compound formed from the reaction of an acid with a base. There are several methods for making salts, depending on whether the salt is soluble or insoluble and the nature of the reactants. Common methods include reacting an acid with a metal, an insoluble base, or a carbonate.
Making Salts is easiest to revise when it is treated as a precise exam behaviour, not a loose note-taking category. In GCSE Chemistry, the goal is to recognise how the topic appears in a question, identify the command word, and decide what evidence, method, or vocabulary earns marks. StudyVector keeps this page tied to AQA · Edexcel · OCR language where coverage is available, then routes practice towards the same topic so revision moves from explanation into retrieval.
A strong revision session starts with a short recall check. Write down the rule, definition, process, or method linked to Making Salts before looking at any notes. Then answer one exam-style prompt and compare your answer with the mark-scheme logic: did you make a clear point, support it with the right step, and avoid drifting into a nearby topic? This matters because many lost marks come from almost-correct answers that do not match the expected structure.
Use this guide as the first layer: understand the topic, look at the worked examples, complete the mini quiz, then move into full practice. The full StudyVector practice loop is designed to capture whether mistakes are caused by knowledge, method, language, or timing. That distinction is important. If the error is factual, you need reteaching. If the error is method-based, you need a worked retry. If the error is wording, you need command-word calibration. That is how Making Salts becomes a controlled revision target rather than another page in a folder.
Lost marks → repair task
Why marks are usually lost here
These are the error patterns StudyVector looks for after an attempt. The goal is not a generic explanation; it is one repair move and one follow-up question.
Unit, formula, or method slip
Examiner move: Select the correct method and keep units, substitutions, signs, and rounding visible.
Repair drill: Redo the calculation or method line slowly, naming the formula before substituting values.
Missing chain of reasoning
Examiner move: Show the link between point, method, evidence, and conclusion instead of jumping to the final line.
Repair drill: Write the missing because/therefore step, then retry one isomorphic question.
Command-word miss
Examiner move: Answer the action in the command word before adding extra detail.
Repair drill: 60-second rewrite: start the answer with explain, compare, evaluate, state, or calculate in mind.
Mini quiz
Use these checks before full practice. They test topic recognition, exam technique, and whether you can connect the explanation to a marked response.
1. What should you check first when a Making Salts question appears in GCSE Chemistry?
- A.The command word and the exact topic focus
- B.The longest paragraph in your notes
- C.A memorised answer from a different topic
2. Which revision action gives the strongest evidence that Making Salts is improving?
- A.Rereading the explanation twice
- B.Answering a timed exam-style question and reviewing lost marks
- C.Highlighting every key phrase in the topic notes
Sample questions
Topic-specific public question previews are still being reviewed. We keep them off public pages until the topic match is safe.
Exam tips
- Read the command word carefully — "explain" needs reasons; "state" expects a short fact.
- For Making Salts, show structured working even when you are practising multiple choice — it builds accuracy under time pressure.
- Mark yourself against the mark scheme style: one clear point per mark, in logical order.
- Come back to this topic after a day or two; short spaced reviews beat one long cram.
Worked examples
Example 1
Modelled exam response
To make pure, dry crystals of copper(II) sulfate, you would add excess copper(II) oxide (an insoluble base) to sulfuric acid and warm gently. Filter the mixture to remove the unreacted copper oxide. Then, heat the resulting blue solution to evaporate about half the water, and leave it to cool and crystallise.
Example 2
Identify the task before answering
Question type: a Making Salts prompt asks for a clear response in GCSE Chemistry. Step 1: underline the command word. Step 2: name the exact part of Making Salts being tested. Step 3: decide whether the mark scheme wants a definition, method, explanation, comparison, or calculation. Why it works: most weak answers fail before the content starts because they answer the topic generally rather than the exact exam task.
Example 3
Turn feedback into a repair task
Suppose your answer shows partial understanding but loses marks for precision. First, rewrite the missing mark as a short target: "I need to state the mechanism, unit, reason, or evidence explicitly." Then answer one similar question without notes. Finally, compare the second attempt with the first and check whether the same mark was recovered. Why it works: Making Salts improves faster when feedback creates a specific retry, not another passive reading session.
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Common mistakes
- Choosing the wrong method to make a particular salt. For example, you cannot make a salt of a very reactive metal (like sodium) by adding the metal directly to acid, as the reaction is too violent.
- Forgetting the steps for crystallisation. After filtering to remove excess reactant, the solution must be gently heated to evaporate some water, then left to cool so crystals can form.
- Not washing the crystals after they are formed. The crystals should be washed with a small amount of distilled water and then dried to obtain a pure sample.
Exam board notes
The preparation of salts is a key practical topic for all exam boards. You need to know the different methods and be able to describe the practical steps involved in making a pure, dry sample of a salt. Titration is a required practical for all boards.
FAQs
How do you make an insoluble salt?
Insoluble salts are made by a precipitation reaction. This involves mixing two solutions containing the ions that make up the insoluble salt. For example, mixing solutions of lead(II) nitrate and sodium chloride will produce a precipitate of insoluble lead(II) chloride.
What is a titration?
A titration is a technique used to make a soluble salt from an acid and an alkali. It allows you to find the exact volume of acid and alkali that are needed to neutralise each other, so you get a pure salt solution with no excess acid or alkali.
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