At What Point in the Following Titration Curve for a Weak

question 74

Multiple Choice

At what point in the following titration curve for a weak acid being titrated with a strong base is the pH equal to the pK_a of the acid? The x-axis scale goes from 0.0 mL to 20.0 mL.The sharp rise is at 10.0 mL.

• A)0.0 mL
• B)5.0 mL
• C)9.0 mL
• D)10.0 mL
• E)18.0 mL

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Definitions:

Pistil

The female reproductive organ of a flower; consists of either a single carpel or two or more fused carpels. See carpel.

Structure Labeled

In microscopy, the identification and tagging of specific cellular or molecular components with labels or markers for study.

Anther

The part of the stamen in flowers that produces microspores and, ultimately, pollen grains.

Endosperm

A nutritive tissue in seeds of most flowering plants, providing sustenance to the developing embryo.