Saved Bookmarks
| 1. |
What is natural indicator ? |
| Answer» Natural Indicator: Indicators obtained from natural sources are called natural indicators. Litmus, turmeric, red cabbage, China rose, etc. are some common natural indicators used widely to show the acidic or basic character of substances.Litmus: Litmus is obtained from lichens. The solution of litmus is purple in colour. Litmus paper comes in two colour – blue and red.Red cabbage: The juice of red cabbage is originally purple in colour. Juice of red cabbage turns reddish with acid and turns greenish with base.Olfactory Indicators: Substances which change their smell when mixed with acid or base are known as olfactory indicators. For example onion, vanilla, clove, etc.Onion: Paste or juice of onion loses its smell when added with base. It does not change its smell with acid.Vanilla: The smell of vanilla vanishes with base, but it’s smell does not vanishes with an acid. | |