While diluting an acid,
[question] Question. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ? [/question] [solution] solution: It is recommended that the acid should be added to water and not water to the acid because the process of dissolving an acid in water is exothermic.If water is added to acid, since large amount of acid is present, a large amount of heat is generated, therefore, themixture splashes out and causes burns. [/solution]...
Why does dry HCl gas not change
[question] Question. Why does dry HCl gas not change the colour of the dry litmus paper ? [/question] [solution] solution: Acid do not ionize in the absence of water to liberate $\mathrm{H}_{3} \mathrm{O}^{+}$which shows acidic nature of a solution. Therefore, dry $\mathrm{HCl}$ gas does not change the colour of the dry litmus paper because it does not contain $\mathrm{H}^{+}$ions. [/solution]...
Why does an aqueous solution
[question] Question. Why does an aqueous solution of an acid conduct electricity? [/question] [solution] solution: Acids dissociate in aqueous solutions to form ions. These ions are responsible for conduction of electricity. [/solution]...
Why do $\mathrm{HCl}, \mathrm{HNO}_{3}$, etc., show acidic character in aqueous solution
[question] Question. Why do $\mathrm{HCl}, \mathrm{HNO}_{3}$, etc., show acidic character in aqueous solution while solutions of compounds like alcohol and glucose do not show acidic character? [/question] [solution] solution: $\mathrm{HCl}$ and $\mathrm{HNO}_{3}$ dissociate in the presence of water to form hydrogen or hydronium ions. Although aqueous solutions of glucose and alcohol contain hydrogen, these cannot dissociate in water to form hydrogen or hydronium ions. Hence, they do not show ac...
Metal compound A reacts with dilute hydrochloric acid to produce effervescence.
[question] Question. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. [/question] [solution] solution: $\mathrm{CaCO}_{3}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{CaCl}_{2}(\mathrm{~s})+\mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\ell)$...