A Buffer Is Prepared by Dissolving 70 Millimoles of Solid

question 6

Multiple Choice

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)III,IV,and V
• B)II,III,IV,and V
• C)1,III,and IV
• D)I,II,and V
• E)I and II

---

Definitions:

Osmosis

The movement of water molecules through a semipermeable membrane from a region of lower solute concentration to one of higher concentration, balancing solute concentrations on both sides of the membrane.

Urine pH

A measure of the acidity or alkalinity of urine, which can be an indicator of various health conditions or dietary influences.

Glomerular Membrane

A semi-permeable membrane in the kidney's glomeruli that filters blood to form urine.

Bacterial Toxins

Substances produced by bacteria that can cause disease in humans and animals.