Write the chemical name and formula of the following:
$(a)$ Salt formed by the combination of a weak acid like carbonic acid and a strong base like sodium hydroxide.
$(b)$ Basic substance formed by the chlor-alkali process.
$(c)$ Substance added to cakes to make them fluffy.

(N/A) The salt formed by the reaction of carbonic acid $(H_{2}CO_{3})$ and sodium hydroxide $(NaOH)$ is sodium carbonate,with the formula $Na_{2}CO_{3}$.
$(b)$ The chlor-alkali process involves the electrolysis of brine $(NaCl$ solution$)$,which produces sodium hydroxide $(NaOH)$,chlorine gas,and hydrogen gas. The basic substance formed is sodium hydroxide $(NaOH)$.
$(c)$ Sodium hydrogen carbonate $(NaHCO_{3})$,also known as baking soda,is added to cakes. Upon heating,it releases carbon dioxide gas,which makes the cakes fluffy.