Question

classify the following substances as acidic, basic, or neutral: a. a soapy solution, pH = 9 b. a sour liquid, pH = 5 c. a solution with four times as many hydronium ions as hydroxide ions

Answer 1

Substances can be classified based on their pH value:

soapy solution (pH=9) is basic, sour liquid (pH=5) is acidic, and a solution with more hydronium than hydroxide ions is acidic.

Step-by-step explanation:

In chemistry, a solution is classified as acidic, basic, or neutral based on its pH value. pH is a measure of how acidic or basic a solution is. Solutions with a pH less than 7 are acidic, those with a pH greater than 7 are basic, and those with a pH of 7 are neutral.

In this case:

a. A soapy solution with a pH of 9 is basic.

b. A sour liquid with a pH of 5 is acidic.

c. A solution with four times as many hydronium ions as hydroxide ions is acidic, as it has a greater concentration of hydronium ions.

Answer 2

A. Soapy solution (pH of 9) = basic
B. Sour liquid (pH of 5) = acidic
C. Solution with four times as many hydronium (H+) ions as hydroxide ions (OH-) = acidic

Soapy solution with a pH of 9 is basic because it has a pH greater than 7. The same goes for the sour liquid with a pH of 5, which has a pH lower than 7, making it acidic. The word sour also hints at it being acidic because of the definition of Bronsted acids. Finally, higher H+ ion concentrations make a solution more acidic.