Question

10. Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids.
Describe an activity to prove it.
11. (A) Milkman adds a very small amount of baking soda to fresh milk
(i) Why does he shift the pH of the fresh milk from 6 tò slightly alkaline?
(ii) Why does this milk take a long time to set as curd?
(B) What is a neutralisation reaction? Give two examples.
12. (A) While diluting an acid, why is it recommended that the acid should be added to water and not
water to the acid?
(B) Write three steps involve in the prepration of Washing soda
3
Or
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How
will you test for the presence of this gas?​

Answer 1

Answer:

When the milk is made more alkaline by adding a base to it, it is basically done to prevent it  for more time to turning to curd. That’s why milkman shifts the pH of fresh milk to slightly alkaline by adding a very small amount of baking soda to it as baking soda is alkaline in nature and it neutralizes the acidic nature of milk.

b) As this milk is slightly more alkaline than other, therefore, acid produced to set into curd will be neutralized by baking soda added by milkman. Hence, this milk takes a longer time to set as curd.