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Indictors and pH - Coggle Diagram
Indictors and pH
The pH Scale
pH 7 is neutral, it is neither an acid or an alkali. Like pure water.
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All acids and alkalis have a pH, which is a number from 0-14 to tell you how strong the acid, alkali is.
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Each pH number has a colour. They are the colour the chemical will go if universal indicator is added to it.
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Indicators
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Litmus indicator solution turns red in acidic solutions, blue in alkaline solutions, and purple in neutral solutions.
Acids
When acids dissolve in water they produce hydrogen ions, H+. These are sometimes called protons, because hydrogen ions are the same as a hydrogen nucleus (which is a proton).
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Alkalis
When alkalis dissolve in water they produce hydroxide ions, OH-.