A Weak Acid Has Ka = 1

question 83

Multiple Choice

A weak acid has Ka = 1.00 × 10^-3. If [HA] = 1.00 M what must be [A-] for the pH to be 2.7?

• A) 0.50 M
• B) 2.0 M
• C) 2.7 M
• D) 0.37 M
• E) 0.75 M

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Definitions:

Single-Phase

An electrical power system that uses only two wires (one power wire and one neutral) to deliver alternating current.

Conductors

Materials or objects that allow the flow of electrical current in one or more directions.

Kilovolt-Ampere

A unit of apparent power in an electrical circuit, equivalent to 1,000 volt-amperes, commonly used in the electricity sector.

Pure Resistive Load

An electrical load that has no capacitance or inductance, resulting in current and voltage being in phase.