Select all of the statements that are true about a buffer solution. A buffer solution has a pH of 7. A buffer solution always changes color when the pH changes. A buffer solution resists small changes in pH. A buffer solution reacts with acidic solutions. A buffer solution reacts with basic solutions.

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.