HZ Is a Weak Acid

question 133

Multiple Choice

HZ is a weak acid.An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.The pH of the solution was 4.93 at 25.0 °C.The K_a of HZ is ________.

• A)1.2 × 10^-5
• B)6.9 × 10^-9
• C)1.4 × 10^-10
• D)9.9 × 10^-2
• E)2.8 × 10^-12

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Definitions:

Concentration Gradient

The gradual difference in the concentration of solutes in a solution between two regions. In biology, it often refers to differences across a membrane.

Carrier

A molecule or protein that transports substances across a cell membrane, or a person or animal that transmits a disease-causing agent without showing symptoms.

Mediated Transport

The process of moving molecules across a cellular membrane through the use of specific protein channels or carriers.

Carrier Molecules

Molecules that help transport substances across a cell membrane or within the body, similar in function to carrier proteins but can include a broader range of molecules.