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Learner Guide


The PH scale

The pH scale is a measure of how acidic or basic a solution is. It ranges from

0-14, with zero being the most acidic and 14 being the most alkaline. 7, being 

exactly in the middle, is what would be termed as neutral.



Any number less than seven is considered to be acidic – the lower the 

number,the more acidic the substance. 4 -6 would be considered ‘weakly 

acidic’. Any number higher than seven is considered to be alkaline – the

higher the number, the more alkaline the substance. 8-10 would be

considered ‘weakly alkaline’.


Substances which are very strongly acidic or alkaline tend to be reactive and

can be even cause chemical burns, if not handled with care.


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Related Topics

Chemical-equations                                                   Introduction acids

Neutralisation-reactions                                          Chemical-reactions

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