In the Titration of 25

question 21

Multiple Choice

In the titration of 25.0 mL of a solution of a weak acid HX with 0.250 M NaOH, the pH = 4.50 after the addition of 5.0 mL of the NaOH solution. The equivalence point occurs when 30.4 mL of the NaOH solution has been added. What is the ionization constant ( K _a) of HX?

• A) 1.4×10 ^{- 5}
• B) 3.2×10 ^{- 5}
• C) 6.2×10 ^{- 6}
• D) 3.2×10 ^{- 10}
• E) 7.2×10 ^{- 10}

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Definitions:

Insistent Cry

A persistent and forceful crying in infants, which may indicate distress, discomfort, or the need for attention from caregivers.

Anoxia

A condition characterized by an absence of oxygen supply to an organ or a tissue, potentially causing damage or dysfunction.

Hypoxia

Hypoxia refers to a condition or state in which there is a deficiency in the amount of oxygen reaching the tissues of the body, which can lead to various health issues.

Sleep Patterns

The cyclical rhythms of sleep and waking, typically following a daily schedule and influenced by factors such as age, lifestyle, and health conditions.