Measuring pH
Chemistry: AQA GCSE Higher, topic 4.3.8
Measuring pH
There are two main ways of measuring the pH of a substance:
Universal indicator
- The indicator changes to a particular colour depending on the pH of a solution.
pH probe
- The probe returns a number that represents the pH of a solution.
Test yourself on Measuring pH
What are the two main ways of measuring the pH of a substance?
A student adds a few drops of universal indicator to a solution and it turns green. What does this show about the solution?
Why does red cabbage juice change colour when it is added to an acidic or alkaline solution?
A student wants to find the precise numerical pH value of a solution, rather than just knowing if it is acidic or alkaline. Which method should they use?
Select the correct statement in each pair about measuring pH