5. HCl is a molecular gas as a pure substance but acts as an acid in aqueous solution. (a) A sample — Ideal Gas Law, Ion-Dipole Interactions, Weak/Strong Acids Chemistry Question
Problem Context
5. HCl is a molecular gas as a pure substance but acts as an acid in aqueous solution.
(a) A sample of HCl(g) is stored in a rigid 6.00 L container at 7.45 atm and 296 K.
(i) Calculate the number of moles of HCl(g) in the container.
(ii) The rigid 6.00 L container of HCl(g) is cooled to a temperature of 271 K. Calculate the new pressure, in atm, of the HCl(g) .
(b) When HCl ionizes in aqueous solution, Cl−(aq) ions are formed. In the following box, draw three water molecules with proper orientation around the Cl− ion. Use to represent water molecules.
The K a values for three acids are shown in the preceding table.
(c) The following particulate diagram represents the ionization of one of the acids in the data table. Water molecules have been omitted for clarity. Which acid (HNO2, HCl, or HClO4) is represented in the diagram? Justify your answer using the information in the table.