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

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

(1) Methylene blue 

(2) Methyl red 

(3) Phenolphthaline 

(4) Methyl orange 


Answer: (4) Methyl orange is a pH indicator frequently used in titrations. It is often used in titrations because of its clear and distinct color change. Because it changes color 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 color change occurs in acidic conditions. In an acid, it is reddish, and in an alkali, it is yellow. 

Which among the following stage is a suitable indicator when a solution of sodium carbonate is mixed with sulphuric acid?   (1) Methylene blue   (2) Methyl red   (3) Phenolphthaline   (4) Methyl orange


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