State differences between acids and bases.
Differences between acids and bases are as follows:
Acids turn blue litmus to red.
Bases turn red litmus to blue.
Acids are sour in taste.
Bases are bitter in taste.
Chemical nature of such substances is acidic.
The nature bases of such substances is said to be basic.
They are not soapy to touch.
They are soapy to touch.
Example: Hydrochloric acid, acetic acid.
Example: Soaps at our homes, Sodium Hydroxide.
Mark “T” if the statement is true and “F” if it is false:
i. Nitric acid turns red litmus blue. (T/F)
ii. Sodium hydroxide turns blue litmus red. (T/F)
iii. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)
iv. Indicator is a stub stance which shows different colours in acidic and basic solutions. (T/F)
v. Tooth decay is caused by the presence of a base. (T/F)
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labeled. He has to serve the drinks on the demand of customers. One customer wants acidic drink; another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
Consider the following statements:
a. Both acids and bases change colour of all indicators.
b. If an indicator gives a colour change with an acid, it does not give a change with a base.
c. If an indicator changes colour with a base, it does not change colour with an acid.
d. Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
i. All four ii. a and b
iii. b and c iv. Only d