Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid ?

LohaHridoy
  1. Methylene blue
  2. Methyl red
  3. Phenolphthaline
  4. Methyl orange

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Answer: Option 4

Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids. In a solution becoming less acidic, methyl orange moves from red to orange and finally to yellow with the reverse occurring for a solution increasing in acidity. The entire colour change occurs in acidic conditions. In an acid it is reddish and in alkali it is yellow

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