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.
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.
You have been provided with three test tubes. One of them contains distilled water and the other two contaln an acidic solution and a basic solution, respectlvely. If you are glven only red litmus paper. how will you identify the contents of each test tube ?
Why should curd and sour substances not be kept in brass and copper vessels ?
How is the concentration of hydroxide ions $(OH^-)$ affected when excess base is dissolved in a solution of sodium hydroxide ?
A solution turns red litmus blue, its $pH$ is likely to be