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?
Describe the color change of methyl orange in acidic and basic solutions.
Describe the difference between a natural and a synthetic indicator, giving one example of each.
Describe what happens when turmeric is added to a soap solution.
Explain why some indicators are called 'universal indicators'.
Explain why universal indicator is more useful than litmus paper for determining the pH of a solution.
What color does blue litmus paper turn in an acidic solution?
A solution has a pH of 5. When tested with methyl orange, what color will be observed? Explain your answer.
A student is given three colorless solutions: hydrochloric acid, sodium hydroxide, and distilled water. Describe a step-by-step method using only litmus and phenolphthalein to identify each solution.
Describe the limitations of using natural indicators such as red cabbage extract in quantitative pH analysis.
Explain why phenolphthalein is not suitable for titrating a strong acid with a weak base. Include the concept of indicator range in your answer.
