A student is given a concentrated solution that is supposed to contain vinegar, a weak acid. Which of the following experimental tests would best support the claim that the solution is a weak acid rather than a strong acid?
(A) Measure the pH of the solution; if the value is above 7 , then the solution is a weak acid.
(B) Measure the pH of the solution; if the value is below 7 , then the solution is a weak acid.
(C) Measure the electrical conductivity of the solution; if the solution is a good conductor, then the solution is a weak acid.
(D) Measure the electrical conductivity of the solution, if the solution is a poor conductor, then the solution is a weak acid.