Question

The $pH$ values of certain substances are given below.

Substance	pH value
(1) Human blood	$7.4$
(2) Baking soda	$8.2$
(3) Vinegar	$2.5$
(4) Household Ammonia	$12.0$

(a) Which of the substances are acidic in nature?
(b) Which of the substances are basic in nature?

Answer 1

Acid is having the $pH$ less than 7 and more than 7 is basic.

a) Vinegar, because $pH$ is $2.5$ which is less than 7.
b) Household ammonia is basic having $pH=12$.
Baking soda is basic ($pH$ is $8.2$)
Blood is slightly basic ($pH$ is $7.4$)