【Daily Question】Chemical Engineering Principles 379: Phenolphthalein Indicator (May 18)
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The Chemical Engineering Theory section is launching the \"One Question per Day\" campaign starting today, aimed at helping everyone reinforce their basic knowledge of chemical engineering. Subsequent campaigns will cover topics such as \"Principles of Chemical Engineering,\" \"Mass Transfer and Separation,\" \"Thermodynamics in Chemical Engineering,\" and \"Chemical Process Engineering.\" We hope you will give it your full support~~~ Answers to the questions in the \"One Question per Day\" campaign can be viewed directly by replying to the post, and the topic will be closed after 1 day! ! To encourage everyone’s continued participation this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points for correct answers~~~ Short answer question: What is the color change range of phenolphthalein indicator? 8.0-10.0
It is 8.2 to 10.0
The color change range is 8.2 to 10.0
8-10 (none, light red, dark red)
The color change range of phenolphthalein is 8.2 to 10.0, so it can only be used to detect bases, not acids. (Pale red) (Red)
Phenolphthalein: 8-10 (none, light red, dark red)
8.2–10.0 is pink, 10.0 is red
PH 8.0–10.0: changes from colorless to red