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Which of the following is an acid–base indicator? (A) Methanol (B) Methyl orange (C) Methanoic acid (D) Methyl ethanoate - HSC - SSCE Chemistry - Question 1 - 2003 - Paper 1
Question 1
Which of the following is an acid–base indicator? (A) Methanol (B) Methyl orange (C) Methanoic acid (D) Methyl ethanoate
Worked Solution & Example Answer:Which of the following is an acid–base indicator? (A) Methanol (B) Methyl orange (C) Methanoic acid (D) Methyl ethanoate - HSC - SSCE Chemistry - Question 1 - 2003 - Paper 1
Step 1
Identify the Acid-Base Indicator
Answer
To determine which of the options is an acid-base indicator, we need to recognize that acid-base indicators are substances that change color depending on the pH of the solution they are in.
- (A) Methanol: This is an alcohol and does not function as an acid-base indicator.
- (B) Methyl orange: This is a well-known acid-base indicator that changes color from red in acidic solutions to yellow in neutral to basic solutions. Therefore, this is the correct answer.
- (C) Methanoic acid: Although this is an acid, it does not act as a pH indicator.
- (D) Methyl ethanoate: This is an ester and does not function as an indicator.
Based on these identifications, the correct option is (B) Methyl orange.