Consider the Titration of 200

question 88

Multiple Choice

Consider the titration of 200.0 mL of a 0.100 M solution of the weak acid H₂A with 0.200 M NaOH. The first equivalence point is reached after 100.0 mL of 0.200 M NaOH has been added, and the pH is 6.27. The pH after 65.0 mL of 0.200 M NaOH has been added, the pH is 4.95. Calculate the value of K_a2 for H₂A.

• A) 5.37  10^-7
• B) 2.10  10^-5
• C) 1.12  10^-5
• D) 1.40  10^-8
• E) none of these

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Definitions:

Form Perception

The cognitive process of recognizing and understanding the shapes and structures of objects in one's environment.

Color Vision

The ability of the eye to distinguish objects based on the wavelengths of the light they reflect, emit, or transmit.

Lens

A transparent structure in the eye that focuses light on the retina to create clear images.

Retina

A thin layer of tissue at the back of the eye that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain.