The pH of a certain solution is 2.0. How many H⁺(aq)ions are there in 1.0 L of the solution? A)0.01 ions B)100 ions C)2 ions D)6.* 10²¹ ions E)6.* 10²³ ions

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Quizplus · Accepted Answer

The pH of a solution is the negative logarithm (base 10) of the hydrogen ion concentration. A pH of 2.0 means the concentration of H⁺ ions is 10⁻² M, or 0.01 moles per liter. Since 1 mole contains approximately 6.022 * 10²³ entities (Avogadro's number), 0.01 moles of H⁺ ions would contain 0.01 * 6.022 * 10²³ = 6.022 * 10²¹ ions.

The PH of a Certain Solution Is 2