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 10
A colorless solution turns methyl orange yellow. What does this indicate about the solution?
A solution turns blue litmus paper red and has no effect on red litmus paper. Is the solution acidic or basic?
A student adds a few drops of phenolphthalein to a solution and observes a pink color. What can be inferred about the solution?
A student tests vinegar with blue litmus paper and observes a color change. What color does the paper turn and why?
A colorless solution turns methyl orange yellow. What does this indicate about the solution?
A solution turns blue litmus paper red and has no effect on red litmus paper. Is the solution acidic or basic?
A student adds a few drops of phenolphthalein to a solution and observes a pink color. What can be inferred about the solution?
A student tests vinegar with blue litmus paper and observes a color change. What color does the paper turn and why?
Which indicator is colorless in acid and pink in base?
(1) Methyl orange
(2) Phenolphthalein
(3) Litmus
(4) Universal indicator
Which indicator shows a range of colors depending on the pH of the solution?
(1) Litmus
(2) Universal indicator
(3) Methyl orange
(4) Phenolphthalein
Which indicator would you use to distinguish between a strong acid and a strong base?
(1) Universal indicator
(2) Red litmus paper
(3) Methyl orange
(4) Blue litmus paper
Which of the following indicators can be used to test the pH of soil?
(1) Universal indicator
(2) Phenolphthalein
(3) Methyl orange
(4) Red litmus paper
Fill in the blank: A substance that changes color in the presence of an acid or a base is called an __________.
Fill in the blank: Phenolphthalein is __________ in acidic solutions.
Fill in the blank: Red cabbage extract is a __________ indicator.
Fill in the blank: The main use of acid-base indicators is to __________ whether a solution is acidic or basic.
Is it true that methyl orange turns yellow in basic solutions?
Is it true that universal indicator can give a pH value for a solution?
True or False: All acid-base indicators are synthetic chemicals.
True or False: All indicators show the same color change for acids and bases.
