A buffer is prepared by dissolving 70 millimoles of solid NaOH in 500.0 mL of solution with a concentration of 50 mM H₂A.Which of the following are NOT true for the buffer?
I After reaction there is 30 mmol HA⁻ and 20 mmol A²⁻ in solution.
II pH is calculated using .
III After reaction there is 50 mmol HA⁻ and 20 mmol NaOH in solution.
IV pH is calculated using .
V pH = 14 - pOH where pOH is calculated from excess OH⁻.

Question

A buffer is prepared by dissolving 70 millimoles of solid NaOH in 500.0 mL of solution with a concentration of 50 mM H₂A.Which of the following are NOT true for the buffer?
I After reaction there is 30 mmol HA⁻ and 20 mmol A²⁻ in solution.
II pH is calculated using

A buffer is prepared by dissolving 70 millimoles of solid NaOH in 500.0 mL of solution with a concentration of 50 mM H<sub>2</sub>A.Which of the following are NOT true for the buffer? I After reaction there is 30 mmol HA<sup>−</sup> and 20 mmol A<sup>2</sup><sup>−</sup> in solution. II pH is calculated using . III After reaction there is 50 mmol HA<sup>−</sup> and 20 mmol NaOH in solution. IV pH is calculated using . V pH = 14 - pOH where pOH is calculated from excess OH<sup>−</sup>. A) III,IV,and V B) II,III,IV,and V C) 1,III,and IV D) I,II,and V E) I and II

.
III After reaction there is 50 mmol HA⁻ and 20 mmol NaOH in solution.
IV pH is calculated using

.
V pH = 14 - pOH where pOH is calculated from excess OH⁻.

Quizplus · Accepted Answer

The Answer of A buffer is prepared by dissolving 70 millimoles of solid NaOH in 500.0 mL of solution with a concentration of 50 mM H₂A.Which of the following are NOT true for the buffer? I After reaction there is 30 mmol HA⁻ and 20 mmol A²⁻ in solution. II pH is calculated using . III After reaction there is 50 mmol HA⁻ and 20 mmol NaOH in solution. IV pH is calculated using . V pH = 14 - pOH where pOH is calculated from excess OH⁻.

A Buffer Is Prepared by Dissolving 70 Millimoles of Solid