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 11
A solution turns blue litmus red. Is the solution acidic or basic?
A student adds phenolphthalein to a solution and observes no color change. What can be inferred about the pH of the solution?
A student is given a colorless solution and adds methyl orange. The solution turns red. What does this indicate about the solution's pH?
Describe the color change of methyl orange in acidic and basic solutions.
A solution has a pH of 9. Which color would universal indicator show?
(1) Red
(2) Orange
(3) Green
(4) Blue
A student adds phenolphthalein to a solution and observes no color change. What can be inferred about the pH of the solution?
A student is given a colorless solution and adds methyl orange. The solution turns red. What does this indicate about the solution's pH?
A solution is tested with three indicators: litmus (turns blue), methyl orange (turns yellow), and phenolphthalein (turns pink). What can you infer about the approximate pH range of the solution?
A solution has a pH of 9. Which color would universal indicator show?
(1) Red
(2) Orange
(3) Green
(4) Blue
Which indicator changes from red to yellow as the pH increases from 3 to 5?
(1) Methyl orange
(2) Phenolphthalein
(3) Bromothymol blue
(4) Litmus
Which indicator would be most suitable for detecting the endpoint in the titration of a strong base with a weak acid?
(1) Methyl orange
(2) Phenolphthalein
(3) Bromothymol blue
(4) Litmus
Which indicator would you use to titrate a strong acid with a strong base?
(1) Methyl orange
(2) Phenolphthalein
(3) Both can be used
(4) None can be used
Fill in the blank: Bromothymol blue is ______ in acidic solutions and ______ in basic solutions.
Fill in the blank: Phenolphthalein is ______ in acidic solutions.
Fill in the blank: Red cabbage extract turns ______ in basic solutions.
Fill in the blank: The pH range for the color change of methyl orange is approximately ______ to ______.
True or False: All acid-base indicators are synthetic chemicals.
True or False: All indicators have the same pH transition range.
True or False: Indicators can be used to determine the exact pH value of a solution.
True or False: Methyl orange turns yellow in basic solutions.
