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1)Acid–base indicators are generally weak protolytes that change color in solution according to the pH. The acid–base equilibrium of a weak acid type of indicator (HI) in water can be represented as.
An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration. Onion , clove oil and vanilla extract are examples.
2)??? therila...sorry....
3)Some examples of natural indicators are turmeric, grape juice, red cabbage, cherries, onion, beetroot etc.
Examples of synthetic indicators include phenolphthalein, methyl orange etc.
4)Hydrogen gas
Hydrogen gas is produced by active metals in reaction with dilute hydrochloric acid. When a metal reacts with an acid, it forms hydrogen gas and salt.
5)Name of object/ blue litmus /red litmus
soap solution No effect turns blue
lemon juice Turns red no effect
Water - -
6)Dry hydrogen chloride gas has no effect on litmus paper but when hydrogen chloride gas is passed through moist blue litmus paper, the litmus paper changes to red.
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