| A | B |
|---|
| chemical indicator | a substance that shows whether a liquid is acidic or alkaline by changing color |
| universal indicator | a useful mixture of dyes which produces a range of colors that indicate how acidic or alkaline a solution is |
| methyl orange | indicator that turns red in acidic substances and yellow in neutral or alkaline susbtances |
| blue litmus | indicator that turns red in acidic substances (stays blue in neutral or alkaline substances) |
| phenolphthalein | indicator that turns pink in alkaline substances |
| red litmus | indicator that turns blue in alkaline susbtances (stays red in neutral or acidic substances) |
| natural indicator | a plant that can be used to tell whether a liquid is an acid or an alkali by changing color, e.g. red cabbage, beetroot, hydrangea |
