He pH scale It measures the degree of acidity or alkalinity of a solution. Its range is between 0 and 14.
Acids have a pH of less than 7.
Alkalis (or bases) have a pH of More than 7.
pH 7 is neutral.
How is pH measured?
pH is measured with an indicator, which is a dye that changes color in the presence of an acid or alkali.
Commonly used indicators for determining pH
- universal indicator
- Litmus
- Methyl orange
- Phenolphthalein
The image below shows the pH table for Universal indicator.
Universal indicator It is a mix of other indicators.
I have a white version from the image above available for students to use to complete the example charts.
Who created the pH scale?
The pH scale was created by a Danish biochemist named Søren Sørensen in 1909.
Simple science experiments to learn about pH
A very Basic pH indicator It can be made using the liquid left over from boiling the red cabbage in water.
The indicator is purple in color but turns red in the presence of an acid and green if an alkali is added.
A basic indicator can also be made from leaves of a poinsettia plant!
Last updated on October 16, 2023 by Emma Vanstone
The charge What is the pH scale? first appeared in Science experiments for kids.
