Which of the following statements is NOT true? Select all that apply.
Group of answer choices
a. The concentration of H+ can be determined from the concentration of OH- and the Kw.
b. An acid and its conjugate base differ only by one hydroxide ion
c. An acid with a Ka > 1 is considered a weak acid
d. The conjugate base of a strong acid will be a strong base
e. Strong acids are expected to completely ionize in solution
a) The concentration of H + ions can be determined from concentration of OH - and Kw.
ANSWER : TRUE
We have relation, [H+] [OH-]= Kw
[H+] = Kw / [OH-]
If we know the [OH-] then we can calculate [H+], hence given statement is true.
b) An acid and its conjugate base differ by only one OH -
ANSWER : FALSE
An acid and its conjugate base differ by only one H+.
Example : HCl Cl -
Cl - is a conjugate base of acid HCl. They differ by only one H+ ion. If we remove one H+ ion from HCl we get conjugate base , and if we add one H+ to Cl - we get conjugate acid HCl. Hence, given statement is false.
C) An acid with K a > 1 is considered weak acid.
ANSWER : FALSE
D) The conjugate base of strong acid will be strong base.
ANSWER : FALSE
The conjugate base of strong acid is always weak base.
E) Strong acids are expected to completely ionize in solution.
ANSWER : TRUE
Strong acids : Acids which completely ionize into the solution are called strong acids.
Weak acids : Acids which do not completely ionize into the solution are called weak acids.
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