The sample should be rinsed until the extract has the color of chocolate.

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Multiple Choice

The sample should be rinsed until the extract has the color of chocolate.

Explanation:
During solvent extraction for asphalt content, the rinsing step should remove all dissolved asphalt from the aggregate so the final wash is clear. A chocolate-brown color in the extract means asphalt is still being carried in the solvent and hasn’t been fully removed. The correct endpoint is a colorless (or nearly colorless) extract, indicating the binder is no longer being dissolved by the rinse. Stopping at a chocolate color would give an incomplete extraction and an inaccurate asphalt content. So the statement is not correct.

During solvent extraction for asphalt content, the rinsing step should remove all dissolved asphalt from the aggregate so the final wash is clear. A chocolate-brown color in the extract means asphalt is still being carried in the solvent and hasn’t been fully removed. The correct endpoint is a colorless (or nearly colorless) extract, indicating the binder is no longer being dissolved by the rinse. Stopping at a chocolate color would give an incomplete extraction and an inaccurate asphalt content. So the statement is not correct.

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