Give two important uses of washing soda and baking soda.
Two important used of washing soda and baking soda are as follows :
$(1)$ Washing soda :
$(a)$ It is used in glass, soap, and paper industries.
$(b)$ It is used to remove permanent hardness of water.
$(2)$ Baking soda :
$(a)$ It is used as baking powder. Baking powder is a mixture of baking soda and a mild acid known as tartaric acid. When it is heated or mixed in water, it releases $CO _{2}$ that makes bread or cake fluffy.
$(b)$ It is used in soda-acid fire extinguishers.
Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate) ?
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 long time to set as curd ?
Why does distilled water not conduct electricity, whereas rain water does ?
Why do $HCl$, $HNO_3$, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character ?
Write word equations and then balanced equations for the reaction taking place when -
$(a)$ dilute sulphuric acid reacts with aluminium powder.
$(b)$ dilute hydrochloric acid reacts with iron filings.