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Properties of Acids

What colours ...

Question

What colours do the following indicators turn when added to an acid (such as hydrochloric acid)?
(a) litmus
(b) methyl orange

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Solution

(a) Litmus paper: Blue litmus paper turns red to an acid, whereas red litmus paper remains red.
(b) Methyl orange: Methyl orange changes to red when added to an acid.

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Q. What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
(a) methyl orange
(b) litmus
(c) red cabbage extract

Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(c) litmus and methyl orange

(d) phenolphthalein and litmus

Q. (a) What is produced if an acid is added to a base?
(b) Why does dry HCl gas not change the colour of dry litmus paper?
(c) What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.

(b) Name an acid-base indicator extracted from lichen.

(c) What colour does the methyl orange turn to when put in an acidic solution ?

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Properties of Acids

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