Acid-Base Indicators
Chemistry ⇒ Acids, Bases, and Salts
Acid-Base Indicators starts at 7 and continues till grade 12.
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See sample questions for grade 12
A solution is tested with litmus paper and shows no color change. What can you infer about the solution's pH?
A solution turns phenolphthalein pink but methyl orange yellow. Is the solution acidic, neutral, or basic?
A student adds a few drops of methyl orange to a solution and observes a yellow color. What can be inferred about the pH of the solution?
A student is titrating acetic acid with sodium hydroxide. Which indicator should be used and why?
A solution is tested with litmus paper and shows no color change. What can you infer about the solution's pH?
A solution turns phenolphthalein pink but methyl orange yellow. Is the solution acidic, neutral, or basic?
A student adds a few drops of methyl orange to a solution and observes a yellow color. What can be inferred about the pH of the solution?
A student is titrating acetic acid with sodium hydroxide. Which indicator should be used and why?
Which indicator would be most appropriate for a titration between a weak acid and a strong base? (1) Methyl orange (2) Phenolphthalein (3) Bromocresol green (4) Congo red
Which indicator would you select for a titration between a strong acid and a weak base? (1) Methyl orange (2) Phenolphthalein (3) Bromothymol blue (4) Thymol blue
Which indicator would you use to titrate a strong acid with a strong base? (1) Methyl orange (2) Phenolphthalein (3) Bromothymol blue (4) Congo red
Which of the following indicators has a color change interval closest to neutral pH? (1) Methyl orange (2) Phenolphthalein (3) Bromothymol blue (4) Thymol blue
Fill in the blank: Phenolphthalein turns ______ in basic solutions.
Fill in the blank: The color of bromothymol blue at pH 7 is ______.
Fill in the blank: The color of methyl orange in a solution with pH 2 is ______.
Fill in the blank: The color of phenolphthalein in a neutral solution is ______.
True or False: All acid-base indicators are synthetic chemicals.
True or False: All indicators have the same transition interval.
True or False: Indicators can be used to determine the exact pH of a solution.
True or False: The color change of an indicator is due to a change in its molecular structure.
