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 8
A colorless solution turns pink when phenolphthalein is added. What does this indicate?
A solution does not change the color of either red or blue litmus paper. What can you conclude about the solution?
A solution turns yellow when methyl orange is added. Is the solution acidic or basic?
A student adds a few drops of methyl orange to a solution and observes a red color. What does this indicate about the solution?
A colorless solution turns pink when phenolphthalein is added. What does this indicate?
A solution does not change the color of either red or blue litmus paper. What can you conclude about the solution?
A solution turns yellow when methyl orange is added. Is the solution acidic or basic?
A student adds a few drops of methyl orange to a solution and observes a red color. What does this indicate about the solution?
Which indicator is best for detecting weak acids and bases?
(1) Litmus
(2) Universal indicator
(3) Turmeric
(4) Methyl orange
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 distinguish between a strong acid and a weak acid?
(1) Litmus
(2) Universal indicator
(3) Turmeric
(4) Methyl orange
Which of the following indicators can show a range of colors depending on the pH?
(1) Litmus
(2) Universal indicator
(3) Phenolphthalein
(4) Turmeric
Fill in the blank: An indicator that is made from plants is called a ______ indicator.
Fill in the blank: In a neutral solution, litmus paper remains ______.
Fill in the blank: Litmus is obtained from ______.
Fill in the blank: Methyl orange turns ______ in acidic solutions.
Is it true that all indicators show the same color change for acids and bases?
True or False: All acid-base indicators are synthetic.
True or False: All acid-base indicators work in the same pH range.
True or False: Indicators can only be used in liquid solutions.
