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

question 45

Multiple Choice

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

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Definitions:

Acetone

A volatile, flammable, and colorless liquid ketone, often used as a solvent in the manufacture of plastics and other industrial products, as well as a nail polish remover.

Tetrahedral Geometry

A shape formed when a central atom is surrounded by four atoms at the corners of a tetrahedron.

Phenol

An organic compound consisting of a benzene ring bonded to a hydroxyl group, used in the manufacture of plastics and pharmaceuticals.

Tetrahedral Geometry

Tetrahedral geometry describes a molecular shape where a central atom is bonded to four other atoms, all at the corners of a tetrahedron, with bond angles of approximately 109.5°.