Tuesday, June 16, 2015

What is strong acid and weak acid?

The pH scale is used to measure how acidic or basic a
substance is.  The scale goes from 0 to 14.  A substance with a pH of 0 through 6 is
considered an acid, while a substance with a pH of 8 through 14 is considered a base.  A
pH of 7 is neutral.  Uncontaminated, pure water is neutral.  The closer the number is to
7, the weaker the substance is.  The farther the number is from 7, the stronger the
substance is. 


A substance with a pH of 1 or 2 would be
a strong acid.  A substance with a pH of 5 or 6 would be a weak
acid.


A substance with a pH of 13 or 15 would be a strong
base.  A substance with a pH of 8 or 9 would be a weak
base.


An example of a strong acid is vinegar.  The pH of
vinegar is 2.4.  An example of a weak acid is citric acid.  The pH of citric acid is
4.8.

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