Asked by angel
Ca(OH)2 is added to a large beaker of water. How is the solution different from the original water?
The solution turns blue litmus to red.
The solution turns phenolphthalein pink.
The solution has more hydrogen ions.
The solution has fewer hydroxide ions.
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Correct answer: The solution turns phenolphthalein pink.
Explanation: Ca(OH)2 is a strong base (dissociates to Ca2+ and OH−), so it increases the OH− concentration and raises the pH. That will make phenolphthalein turn pink (basic indicator). It will not turn blue litmus to red (bases turn red litmus blue), it does not increase H+ concentration (it decreases H+), and it does not decrease OH− (it increases OH−).
Explanation: Ca(OH)2 is a strong base (dissociates to Ca2+ and OH−), so it increases the OH− concentration and raises the pH. That will make phenolphthalein turn pink (basic indicator). It will not turn blue litmus to red (bases turn red litmus blue), it does not increase H+ concentration (it decreases H+), and it does not decrease OH− (it increases OH−).
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