Question

1. what did all indicators have in common?
2. what was the purpose of the distilled water?
3. what organic compound(s) were present in the unknown?

Explanation:

1. Indicators are substances that change color in response to a change in the acidity or basicity of a solution. So they all change color depending on the solution's pH.
2. Distilled water is often used as a control in experiments to compare results with solutions that contain other substances. It is also free of impurities which could interfere with chemical reactions.
3. Without any experimental data or context about the unknown sample, it's impossible to determine the organic compounds present. Usually, tests like combustion analysis, spectroscopy (e.g., IR - infrared, NMR - nuclear magnetic resonance) are used to identify organic compounds.

Answer:

1. They change color depending on pH.
2. To act as a control or to avoid interference from impurities.
3. Cannot be determined without more information.