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

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.

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

Domain eukarya; kingdom plantae should be the answer.