Which of these is correct about methyl orange?
CHEMISTRY
POST UTME OAU
Which of these is correct about methyl orange?
- A) Yellow in excess aqueous hydrogen ions
- B) Pink in excess aqueous hydrogen ions
- C) Orange in excess aqueous hydrogen ions
- D) Colourless in excess aqueous hydrogen ions
Correct Answer: A) Yellow in excess aqueous hydrogen ions
Explanation
Methyl orange is a pH indicator commonly used in acid-base titrations. It changes color depending on the pH of the solution it is added to. Indicators like methyl orange help us determine the endpoint of a titration, which is when the reaction between the acid and base is complete.The correct answer for this question is Option A: Yellow in excess aqueous hydrogen ions. Methyl orange exhibits a yellow color in acidic solutions with excess hydrogen ions (H+) and a red color in basic solutions with a lack of hydrogen ions. The color change occurs around pH 3.1 to 4.4.
It is important to note that other indicators are available, each with their own specific color change range. The choice of an indicator depends on the specific reaction being studied and the desired accuracy of the titration. In the case of methyl orange, it is most suitable for titrations involving a strong acid and a weak base
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