A galvanic cell is composed of these two half cells, with the standard reduction potentials shown CO2+(aq) + 2 e‑ º Co(s) ‑0.28 volt
Cr3+(aq) + 3 e‑ º Cr(s) ‑0.74 volt
The actual Co2+(aq) concentration is 0.00100 M, while the Cr3+(aq) concentration is unknown.
The actual cell potential Ecell measured 0.38 volts. What is the actual concentration of the Cr3+ ion
in the cell?
a. 0.00180 M
b. 0.00500 M
c. 0.0090 M
d. 0.0360 M
e. 0.360 M

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.