Did you know?

ph really means "power of hydrogen". This is used to measure acidity or alkalinity( I suppose you already know this part). There is two ways of calculating the ph of a substance:

1. With a complicated equation:

or

2. With universal indicators like: red cabbage, litmus paper, phenolphthalein, methyl orange, phenol red, bromothymol blue, and bromocresol purple.

Another example of universal indicator is the plant Hydrangea macrophylla, which flowers change of colour depending of the pH of the soil (acid soil=blue flowers, alkaline soil=pink flowers)

(All links go to Wikipedia)

See you!