Question detail
How can pH testing be used to assess the quality of water samples?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Using the Earth's resources and obtaining potable water
Question
How can pH testing be used to assess the quality of water samples?
Answer
pH testing measures the acidity or alkalinity of water. A pH level between 6.5 and 8.5 is generally considered safe for drinking. Deviations from this range may indicate contamination or the presence of harmful substances.
Explanation
A strong answer should directly address the approved learning objective to carry out analysis and purification of water samples from different sources, including pH testing, dissolved solids and distillation. (Required practical 8; AT 2, 3, 4). This question belongs to Potable water within Using the Earth's resources and obtaining potable water, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to distillation, and keeps the wording specific to AQA GCSE revision.
Common mistake
Common Mistake in Water Purification
Students often confuse the process of distillation with simple filtration, thinking both methods achieve the same result.
Emphasize that distillation involves heating water to create vapor and then cooling it to collect pure water, while filtration simply removes larger particles from the water.
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