Which statement best describes a weak acid?
a. an acid in a dilute solution
b. an acid that dissociates completely in solution
c. an acid in a concentrated solution
d. an acid that dissociates only slightly in solution

D. An acid that dissociates only slightly in solution

Explanation:

A weak acid is an acid that is slightly dissociated into its ions in a solution.  At similar concentration, weak acids have higher pH value than strong acids.

Examples of weak acids includes acetic acid, hydrogen sulfide, formic acid,

hydrofluoric acid etc.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

i think it's letter a.