Which of the following is a possible definition of a base?

a. a substance that increases the concentration of hydronium ions in a solution
b. a compound that is a hydrogen ion acceptor in an acid-base reaction
c. a compound that gives off hydrogen ions in a reaction or solution
d. a substance that is an electron pair acceptor in a reaction

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?