Practice: Volumetric Analysis

A titration experiment was performed to determine the concentration of sulfuric acid using a known concentration of potassium hydroxide. 100 mL of sulfuric acid was placed in a conical flask and a few drops of phenolphthalein indicator were added. A 0.6 M solution of potassium hydroxide was then slowly added into the conical flask. The amount of potassium hydroxide added and any observations were recorded.

Volume of KOH Added (mL) 35.4 35.6 35.8 36.0 36.2 36.4 36.6 36.8 37.0 37.2 37.4 37.6
Observations Colorless Colorless Colorless Pink color that fades quickly to colorless Pink color that fades quickly to colorless Pink color that fades slowly to colorless Pink color that fades slowly to colorless Pink color that lasts ~30 seconds Pink Pink Pink Pink

At what volume was the end point of the reaction reached?

mL

What was the concentration of the sulfuric acid? Give your answer to 3 decimal places.

M

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Incorrect Answer

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