Give the precise reason for each of the followinga) Aqueous solution of a base conducts electricity.
b) Dry litmus paper does not change its colour with dry HCl gas but wet
litmus paper does.
c) Sour substances are not stored in metal containers.
d) Water should not be added to concentrated acid when we are
diluting it.
e) The reaction of metal oxide with acid can be considered as
neutralization reaction.
Answers
Explanation:
a) The charged particles ions are present in the aqueous solutions Hydrogen and hydronium ions. These ions carry electric currents thus acids conducts electricity. Bases are also electrolytes that give ions in aqueous solutions and these ions help to conduct electricity.
b) Dry HCL it does not dissociate to give H+ ions. Acids dissociate to give ions only in the aqueous solution. In this, HCL is not in the aqueous form nor the litmus paper is wet, so the colour of the litmus paper does not change.
c) Curd and sour substances contain acids. Acids react with metals to produce salt and hydrogen gas. So, if such substances are kept in copper container, the acid will react and the container will be corroded.
d) Dilution of concentrated acid is an exothermic process. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. When the acid is added to water slowly with constant stirring, the mixture will not splash out.
e) An acid neutralizes a base when they react with each other and salt and water are formed. Since in the reaction between acid and metal oxide both neutralize each other, hence it is also known as neutralization reaction.