Question

14.
(a)
Define indicator. Name two indicators obtained from plants.
(b)
Write balanced chemical equation for the reaction that takes place when sodium
oxide reacts with water. How will this solution behave towards phenolphthalein
and red litmus paper ?
(c)
State what happen when sodium hydroxide solution reacts with dilute hydrochloric
acid. What is this reaction called ?
(2015)​

Answer 1

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Answer the above sub - questions.

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(a) Indicators are dyes or mixtures of dyes used to indicate the presence of acids and bases.

Litmus and turmeric are natural indicators obtained from plants.

(b) Na2O + H2O --------) 2NaOH

NaOH turns phenolphthalein to pink and red litmus blue

(c) NaOH + HCl ---------) NaCl + H2O

It is called a neutralisation reaction because and acid reacts with a base to produce salt and water.

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Answer 2

a) and indicators tell us whether this substance be testing is an acid or a base by changing in its colour.

the two indicators obtained from plants are:- Litmus and turmeric