The pH scale is used to indicate the acidity of a solution based on the concentration of hydrogen ions in the solution. The scale ranges from 0 to 14, and solutions with low pH numbers are more acidic than those with high pH numbers. Vinegar is a acidic solution with a pH of 2.2, indicating that it contains 1 × $10 ^ { - 2 }$ g of hydrogen ions per liter. Write this number in decimal form.
A) 0.01 g of hydrogen ions/L
B) 0.1 g of hydrogen ions/L
C) 1 g of hydrogen ions/L
D) 10 g of hydrogen ions/L
E) 100 g of hydrogen ions/L

Question

Quizplus · Accepted Answer

The notation $10^{-2}$ means $1/10^2$ or $1/100$, which in decimal form is 0.01.

The PH Scale Is Used to Indicate the Acidity of a Solution