Question

Give answers
a. Which acid is used for getting chloride salt ?
b. By squizzing lemon on a piece of rock the gas liberated turned lime water milky. which compound is present in the rock ?
c. The label on the bottle of chemical is spoiled. How will you find whether the chemical is acidic or not ?

Answer 1

a.Acid used for getting chloride salt is HCl because this acid provides chloride ion to form chloride salt.
For example :
$$\begin{gathered} \mathrm{HCl}+\mathrm{NaOH}\to \mathrm{NaCl}+{\mathrm{H}}_2\mathrm{O} \\ \mathrm{HCl}+\mathrm{Mg}(\mathrm{OH}{)}_2\to {\mathrm{MgCl}}_2+{\mathrm{H}}_2\mathrm{O} \end{gathered}$$

b.Compound presents in the rock is either a compound of carbonate or bicarbonate because acids react with carbonate or bicarbonate and liberate CO_2. This carbon dioxide turns lime water milky.

c.The chemical is acidic or not checked by two ways :
1.By use of litmus paper : If the given solution is acidic, it turns blue litmus to red litmus.
If the given solution is basic, it turns red litmus to blue litmus.
If the given solution is neutral, there is no effect on litmus paper.
2.By use of indicators : If the given solution is acidic, it turns methyl orange to red.
If the given solution is basic, it turns methyl orange to yellow
If the given solution is neutral, there is no effect on methyl orange indicator.