Question

Question #43a9c

Answer 1

HCl, hydrogen chloride

Explanation:

A conjugate acid is obtained, in the Brönsted-Lowry scheme, by protonating a base; chloride ion in this example. To protonate means to add a proton, i.e. an hydrogen ion `H^+`:

`Cl^"-" + H^+ = HCl`

Hydrogen chloride is a molecular gaseous substance. It can be prepared from the conjugate base `Cl^-` by adding concentrate sulphuric acid to a chloride salt and heating the mixture.

`H_2SO_4(l) + NaCl(s) -> HCl(g) + NaHSO_4(s)`

`HCl(g)` can be dissolved in water up to 36% concentration w/w. Dissolution is accompained by complete ionisation to give rise again to the conjugate base `Cl^-` (chloride) and hydrated hydrogen ions (`H^+`)