finds out how you can make your own
from Red Cabbage
The name and symbol, pH, stands for
Acidity is caused by hydrogen atoms that have lost their electrons and are roaming free in water [H+].
The opposite of acidic is alkaline (or basic).
Alkaline gets its name from the "al kali" plant whose ashes are capable of neutralizing acids.
It does this because it contains KOH.
The "OH" is called hydroxide and it combines with the acid [H+] to form water.
We are able to test the acidity or alkalinity of a substance with litmus paper or a litmus solution.
pH is a measure of the acidity or alkalinity of a solution. Aqueous solutions at 25°C with a pH less than seven are considered acidic, while those with a pH greater than seven are considered basic (alkaline).
When a pH level is 7.0, it is defined as 'neutral' at 25°C.
Litmus was used for the first time about 1300 AD by Spanish alchemist Arnaldus de Villanova .
From 16th century on the blue dye was extracted from some lichens, especially in the Netherlands.
The cabbage juice that we are going to use is called an indicator and is the same as the litmus paper we use.
How to make and use the red cabbage litmus solution
The resultant solution will be somewhat crude as we have used only plain tap water and done nothing about purifying the equipment.
It will be good enough for our initial experiments though.
You can try the experiment with other household stuff and for more complete details log on to