Chemistry 12 - weak acid/electrical conductivity (2 questions)

[katyross]

Homework Statement

" Which of the following best describes a weak acid?"
A. Its 0.10 M solution will have a pH = 1.00
B. It may be very soluble, but only partly ionized.
C. It must be very soluble and completely ionized
D. It must be of low solubility and completely ionized

Homework Equations

The Attempt at a Solution

Homework Statement

"Which of the following solutions would typically show the greatest electrical conductivity?

A. 1.0 M weak acid
B. 0.8 M weak base
C. 0.5 M strong acid
D. 0.1 M strong base

Homework Equations

The Attempt at a Solution

I know that the strong acid will conduct electricity better than the weak acid if the concentrations are the same, but because they're not does that mean that more of a weak acid will equal a smaller amount of strong acid? Also, would you ignore both the strong and weak bases?

 

[Timmey19]

For your first question, a weak acid does not ionise much, usually less that 5%.
So i would be going with question B., as for A, it seems a weird this to put in a multi choice question.

an acid or base that strongly conducts electricity is a "strong acid or base", and no don't ignore the bases, as for concentrations, think pretty hard about how concentration effects behaviours of acids and bases

 

[Blueshift5]

A. The most accurate description of a weak acid is option B - it may be very soluble, but only partly ionized. This means that a weak acid will dissolve in water, but only a small portion of it will ionize into ions (H+ and an anion).

B. The solution with the greatest electrical conductivity would be option C - 0.5 M strong acid. This is because strong acids completely ionize in water, producing a high concentration of ions that can conduct electricity. Weak acids, on the other hand, only partially ionize, so their solution will have a lower concentration of ions and therefore lower electrical conductivity. The weak base solutions (option A and B) will also have lower electrical conductivity compared to the strong acid solutions. The strong base solution (option D) will have a similar conductivity to the strong acid solution, as both are fully ionized in water.