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 Form 1 Chemistry: Acids, bases and indicators online lessons

What is a PH scale ?

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Answer Text:
The pH scale.
- Is a scale of numbers which shows the strength of acids or bases.
- It refers to the potential (power) of hydrogen;
- It ranges from 0 – 14;
- To determine the strength of an acid or base, the colour it gives in universal indicators solution is compared to the shades on the pH chart of the indicator;
Diagram: The pH scale.
figindicators26820201229.JPG
Note:
- The strongest acid has a pH of 1;
- The strongest alkali has a pH of 14;
- Neutral substances have a pH of 7;
- Any pH less than 7 is acidic solution; while any pH above 7 is for a alkaline / basic solution;


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