Question

flask mouth Compound Initial observations Sr. No. Litmus test PE of sohasian Salt (NaCl) 1. Blue litmus - Red litmus - dually 2. Baking soda (NaHCO3) Blue litmus - Red litmus - 3. Washing soda (Na,C0, 101,0) Blue litmus - Red litmus -​

Answer 1

Answer:

Curd, lemon juice, orange juice and

vinegar taste sour. These substances

taste sour because they contain acids.

The chemical nature of such

substances is acidic. The word acid

comes from the Latin word acere which

means sour. The acids in these

substances are natural acids.

What about baking soda? Does it also

taste sour? If not, what is its taste? Since,

it does not taste sour it means, that it

has no acids in it. It is bitter in taste. If

you rub its solution between fingers, it

feels soapy. Generally, substances like

these which are bitter in taste and feel

soapy on touching are known as bases.

The nature of such substances is said to

be basic.

If we cannot taste every substance,

how do we find its nature?

Special type of substances are used

to test whether a substance is acidic or

basic. These substances are known as

indicators. The indicators change their

colour when added to a solution

containing an acidic or a basic

substance. Turmeric, litmus, China rose

petals (Gudhal), etc., are some of the

naturally occurring indicators.

Explanation: