Question

Methylamine solution is titrated against HCL solution .which will be suitable indicator (1) methyl orange (2) phenolphthalein

Answer 1

Answer:

1. methyl orange

Explanation:

• In acidic and basic media, methyl orange exhibits pink and yellow colours, respectively. It is frequently employed in the titration for acids since it changes colour at the pH of a mid-strength acid. Methyl orange has a distinct end point but lacks the entire spectrum of colour shift of a universal indication.
• Methyl-orange may obstruct the transition of the phenophthalein since it is yellow on the basic side (purple to colorless). The methyl orange indicator should be added after the first equivalence point, when the phenophthalein has turned colourless, if you were to utilise both.
• To determine the concentration of Na2CO3, you would also need to remember to divide the concentration you obtain using two equivalents of acid by two.

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