Question

A(n) _____ is a compound that produces hydrogen ions when dissolved in water.

a. acid
b. buffer
c. base
d. indicator

Answer 1

Answer: a. acid

Step-by-step explanation:

a. Acids are those substances which either donates hydrogen ions
`(H^+)` when dissolved in water or accepts a pair of electrons.

`HCl\rightarrow H^++Cl^-`

b. Buffer is a solution which resist changes in pH on addition of small amounts of acid or base into it.

c. Bases are those substances which either donates hydroxide ions
`(OH^-)` when dissolved in water or donates a pair of electrons.

`NaOH\rightarrow Na^++OH^-`

d. Indicators are chemical compounds which show a change or appearance in color at particular pH. Example: litmus

Answer 2

An acid is a compound that produces hydrogen ions when dissolved in water. The pH of acid is less than 7 because it is rich in H+ concentration. Basic solutions have pH greater than 7 because it is rich in OH-. Neutral solutions meanwhile have pH equal to 7.