C4 - The characteristic properties between acids and bases

  • Created by: MaijaL
  • Created on: 03-05-16 14:20

1 Describe neutrality and relative acidity and alkalinity in terms of pH (whole numbers only) measured using full-range indicator and litmus.

All substances are divided into three categories:

  • Acidic
  • Alkaline
  • Neutral

How can this be measured?

We usually do this by measuring the pH of the substance. 

What is the pH?

Simply a measure of the Hydrogen ion concentration in a substance.

We measure pH using the pH scale.

  • pH 1-6 substances are usually acidic
  • pH 7 substances are usually neutral
  • pH 7-14 substances are usually alkaline

Universal Indicator This is a substance that changes color when it is added to another substance. What color it changes to depends on the pH of the substance. Above: A diagram of a universal indicator

Litmus Paper

This is an indicator also used to test for acidity, neutrality or alkalinity in a substance. We use something called litmus paper to test for this. If we want to test for…


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