1. A sample of hydrogen iodide gas, HI(g), is collected and then dissolved in 10.0 L of water.
Statements About Solutions 1 The pH is less than the pOH 2 The pH is greater than the pOH.
The solution conducts electricity 3 4 The solution does not conduct electricity 5 Almost all of the
HI(aq) ionizes in the solution. Most of the HI(aq) does not ionize in the solution. 6 7 The
concentration of H3O*(aq) is less than the concentration of OH (aq). The concentration of H3O
(a) is greater than the concentration of OH (aq) 8 The statements above that describe the
hydrogen iodide solution are numbered , ,- , and
Solution
Ans :- The statements above that descrive the hydrogen iodide solution are numbered 1 , 4 , 6
and 8 .
Explanation :-
HI(aq) is the weak acid and weak acids are partially dissociated into ions in aqueous solution.
therefore most of HI(aq) does not ionize in the solution and due to this reason HI (aq) solution
does not conduct electricity .
Because HI (aq) is a weak acid therefore pH must be less than pOH and concentration of H 3 O +
(aq) is greater than the concentration of OH -
(aq) .
Note :-
(1) pH scale :-
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
---------------------------------------------------------------------------------------------------------------------
------------------>
Acidic strength decreases Neutral Basic strength increases
[H 3 O +
] decreases [OH -
] increases
pH increases pOH decreases

2. (2) pH + pOH = 14 therefore
pH = 14 - pOH
(3) pH is inversely proportional to the concentration of hydronium ion i.e [H 3 O +
] .