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 9
A student adds a few drops of phenolphthalein to a solution and observes no color change. What can be inferred about the solution?
A student adds blue litmus paper to a solution and it turns red. What does this indicate about the solution?
A student uses turmeric paper to test a solution and observes no color change. What does this indicate?
Describe how red cabbage juice can be used as an acid-base indicator.
A solution has a pH of 2. Which color would universal indicator show?
(1) Red
(2) Green
(3) Blue
(4) Purple
A solution turns red litmus paper blue. Is the solution acidic or basic?
A student adds a few drops of phenolphthalein to a solution and observes no color change. What can be inferred about the solution?
A student adds blue litmus paper to a solution and it turns red. What does this indicate about the solution?
A solution has a pH of 2. Which color would universal indicator show?
(1) Red
(2) Green
(3) Blue
(4) Purple
Which indicator is best for titrating a strong acid with a strong base?
(1) Phenolphthalein
(2) Methyl orange
(3) Universal indicator
(4) Turmeric
Which indicator is colorless in acid and pink in base?
(1) Methyl orange
(2) Phenolphthalein
(3) Litmus
(4) Bromothymol blue
Which indicator would you use to test for a weak acid?
(1) Phenolphthalein
(2) Methyl orange
(3) Universal indicator
(4) Turmeric
Fill in the blank: Litmus paper turns ______ in acidic solutions.
Fill in the blank: Methyl orange turns ______ in acidic solutions.
Fill in the blank: The color of bromothymol blue in a basic solution is ______.
Fill in the blank: The color of phenolphthalein in a neutral solution is ______.
A solution turns red litmus paper blue. Is the solution acidic or basic?
Is it true that methyl orange turns yellow in basic solutions?
True or False: All acid-base indicators are synthetic.
True or False: All indicators change color at the same pH value.
