Answer is: a) in the presence of a base.
Phenolphthalein is colorless in acidic solutions and pink in basic solutions.
Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations.
Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄).
When solution turns phenolphthalein pink, it means it is basic (pH>7).
Hi,
Answer is 191.2.
800J = 191.2 cal
Hope this helps.
Answer:
The atomic mass of nitrogen is
<h2>
14.0067 u</h2>
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<em>You learn more from failure than from success</em></h2>
Chemists have developed insulation.
