Back to the full dot-point answer
SingaporeChemistryQuick questions
Acids, Bases and Salts
Quick questions on The pH scale and indicators explained: O-Level Chemistry
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the pH scale?Show answer
The pH scale runs from about to and measures how acidic or alkaline a solution is:
What are indicators?Show answer
An indicator is a substance that changes colour depending on whether it is in acid or alkali:
What is universal indicator?Show answer
Universal indicator is a mixture of indicators that shows a range of colours across the pH scale, so it gives an approximate pH value rather than just acid or alkali:
What is q1?Show answer
State the pH of a neutral solution and the colour of universal indicator at this pH. [1 mark]
What is q2?Show answer
A solution turns universal indicator red. State its approximate pH and the nature of the solution. [2 marks]
What is q3?Show answer
Explain how the hydrogen ion concentration changes as pH increases from to . [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.