According to the lewis definition, a base is a(n): a. proton donor. b. hydroxide ion donor. c. hydrogen ion donor. d. electron pair donor. e. electron pair acceptor.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

answer; talc and gypsum;