If universal indicator is added to a solution it changes to a colour that shows the pH of the solution. Universal indicator is a mixture of a variety of other indicators and can be used to measure ...

pH is measured using potentiometric methods or pH indicators such as indicator solutions or strips (litmus paper). The pH meter consists of a reference electrode and a pH electrode, and the ...

However, water comes from different sources, like tap water or river water. These water samples have other substances dissolved in them. They might show up as slightly acidic or slightly alkaline ...