Q13 of 34 Page 34

Plaster of Paris should be stored in a moisture-proof container. Explain why?

Plaster of Paris should be stored in a moisture-proof container because it absorbs moisture (or water) to form a hard substance called gypsum which makes Plaster of Paris useless.


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11

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

 12

A milkman adds a very small amount of baking soda to fresh milk.

(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?


(b) Why does this milk take a longer time to set as curd?

 14

What is a neutralization reaction? Give two examples.

 15

Give two important uses each of washing soda and baking soda.