Potable Water — GCSE Chemistry Revision
Revise Potable Water for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Waste Water TreatmentWhat is Potable Water?
Potable water is water that is safe to drink. It is not pure water in the chemical sense, as it contains dissolved minerals and salts, but it has been treated to remove harmful microbes and has acceptably low levels of dissolved substances. The methods used to produce potable water depend on the source and quality of the available freshwater.
Board notes: The treatment of water to make it potable is a key topic for all exam boards. You need to know the difference between pure and potable water and be able to describe the main stages of water treatment. Desalination is also covered, especially as a higher-tier topic.
Step-by-step explanationWorked example
In the UK, water from rivers is stored in reservoirs to allow large solids to settle out (sedimentation). It is then passed through filter beds of sand and gravel to remove smaller particles (filtration). Finally, a small amount of chlorine is added to kill any remaining harmful bacteria (chlorination).
Mini lesson for Potable Water
1. Understand the core idea
Potable water is water that is safe to drink. It is not pure water in the chemical sense, as it contains dissolved minerals and salts, but it has been treated to remove harmful microbes and has acceptably low levels of dissolved substances.
Can you explain Potable Water without copying the notes?
2. Turn it into marks
In the UK, water from rivers is stored in reservoirs to allow large solids to settle out (sedimentation). It is then passed through filter beds of sand and gravel to remove smaller particles (filtration).
Underline the method, evidence, or command-word move that would earn credit in GCSE Using Resources.
3. Fix the likely mark leak
Watch for this mistake: Confusing potable water with pure water. Potable water is safe to drink but is still a mixture; pure water (H₂O) contains no dissolved substances.
Write one correction rule before doing another practice question.
Practise this topic
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Potable Water practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Potable Water is testing.
Answer: Potable water is water that is safe to drink. It is not pure water in the chemical sense, as it contains dissolved minerals and salts, but it has been treated to remove harmful microbes and has acceptably low levels of dissolved substances.
Mark focus: Precise definition and topic focus.
Question 2
A Potable Water question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing potable water with pure water. Potable water is safe to drink but is still a mixture; pure water (H₂O) contains no dissolved substances." What should their next repair task be?
Answer: Do one Potable Water question and review the mistake type.
Mark focus: Error correction and next-step practice.
Potable Water flashcards
Core idea
What is the main idea in Potable Water?
Potable water is water that is safe to drink. It is not pure water in the chemical sense, as it contains dissolved minerals and salts, but it has been treated to remove harmful microbes and has acceptably low levels o...
Common mistake
What mistake should you avoid in Potable Water?
Confusing potable water with pure water. Potable water is safe to drink but is still a mixture; pure water (H₂O) contains no dissolved substances.
Practice
What is one useful practice task for Potable Water?
Answer one Potable Water question and review the mistake type.
Exam board
How should you use board notes for Potable Water?
The treatment of water to make it potable is a key topic for all exam boards. You need to know the difference between pure and potable water and be able to describe the main stages of water treatment.
Common mistakes
- 1Confusing potable water with pure water. Potable water is safe to drink but is still a mixture; pure water (H₂O) contains no dissolved substances.
- 2Thinking that all water needs to be treated in the same way. The treatment required depends on the source. River water needs more treatment than groundwater from an aquifer.
- 3Forgetting the main stages of water treatment: sedimentation, filtration, and chlorination.
Potable Water exam questions
Exam-style questions for Potable Water with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Potable Water
Core concept
Potable water is water that is safe to drink. It is not pure water in the chemical sense, as it contains dissolved minerals and salts, but it has been treated to remove harmful microbes and has accept…
Frequently asked questions
What is desalination?
Desalination is the process of removing salt from seawater to make it drinkable. It is used in countries with a shortage of fresh water. The main methods are distillation and reverse osmosis, both of which require a lot of energy.
Why is chlorine added to drinking water?
Chlorine is a disinfectant. It is added to kill pathogenic microorganisms (like bacteria and viruses) that could cause disease.