Answer the following questions:
(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Write the name of two indicators that occur naturally.

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Solution

(a) Acids that are mostly used in the laboratory as below:

Hydrochloric acid (HCl)

Sulphuric acid $(H_{2} S O_{4})$

Nitric acid $(H N O_{3})$

(b) Turmeric

(c) Natural occurring indicators are:

Turmeric

China rose

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Q. (a) What is an indicator? Name three common indicators.
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(c) What colour does the turmeric paper turn when put in an alkaline solution?

Question 3

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed
(a) Yellow in both acid and base.
(b) Yellow in acid and red in base.
(c) Pink in acid and yellow in base.
(d) Red in acid and blue in base.

(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Name the reaction when an acid is mixed with a base.

(d) Write the name of two indicators that occur naturally.

(e) Name three types of salts. Give one example of each type of salt.

(a) Name one indicator which turns red on adding an acid.

(b) Name one indicator which turns red on adding a base.

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

(b) What colour does the methyl orange turn to when put in an acidic solution?
[3 Marks]

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Answer the following questions: (a) Name three acids used in the laboratory. (b) Name one indicator that turns red on adding a base. (c) Write the name of two indicators that occur naturally.

(a) Acids that are mostly used in the laboratory as below: Hydrochloric acid (HCl) Sulphuric acid (H2SO4) Nitric acid (HNO3) (b) Turmeric (c) Natural occurring indicators are: Turmeric China rose

Answer the following questions:
(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Write the name of two indicators that occur naturally.

(a) Acids that are mostly used in the laboratory as below:

Hydrochloric acid (HCl)

Sulphuric acid $(H_{2} S O_{4})$

Nitric acid $(H N O_{3})$

(b) Turmeric

(c) Natural occurring indicators are:

Turmeric

China rose