Acetic acid is the principal ingredient in vinegar. In a sample of vinegar at equilibrium, and . What is the value of for acetic acid?
What is the hydronium ion concentration in a 0.100 M solution of ammonium nitrate, , a salt composed of the ions and ? of ammonia is .
Caffeine, , is a weak base. What is the value of for caffeine if a solution at equilibrium has , , and ?