During the demonstration, before each metal was added to the water, a drop of an acid-base indicator, phenolphthalein, was added to the water to monitor the reaction. Research “phenolphthalein as an indicator” and explain the color change that you observed in terms of acidic and basic pH.

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A: The solution is given below -

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Q: How do solutions change color throughout the titration process?

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Q: Which indicator has to be used in order to get an emerald green color at a pH of 9?

A: The solution is given below -

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Q: How long, in seconds, would it take for the concentration of A to decrease from 0.810 M to 0.230 M?

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Q: How long, in seconds, would it take for the concentration of A to decrease from 0.690 M to 0.200 M?

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A: ANSWER IS

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