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 x 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
A) 0.01 g of hydrogen ions/L
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