The best indicator for the detection of end point in titration of a we

1.	The best indicator for the detection of end point in titration of a weak acid and a strong base is
Answer» Selection of suitable indicator or choice of indicator: In order to choose a suitable indicator, it is necessary to understand the pH changes in the titrations. The change in pH in the vicinity of the equivalence point is most important for this purpose. The curve obtained by plotting pH as ordinate against the volume of alkali added as abscissa is known as neutralisation or titration curve. The suitable indicators for the following titrations are, (i) Strong acid Vs strong base: Phenolphthalein (pH range 8.3 to 10.5), methyl red (pH range 4.4 – 6.5) and methyl orange (pH range 3.2 to 4.5). (ii) Weak acid Vs strong base: Phenolphthalein. (iii) Strong acid Vs weak base: Methyl red and methyl orange. (iv) Weak acid Vs weak base: No suitable indicator can be used for such a titration.

The best indicator for the detection of end point in titration of a weak acid and a strong base is

Answer»

Selection of suitable indicator or choice of indicator: In order to choose a suitable indicator, it is necessary to understand the pH changes in the titrations. The change in pH in the vicinity of the equivalence point is most important for this purpose. The curve obtained by plotting pH as ordinate against the volume of alkali added as abscissa is known as neutralisation or titration curve. The suitable indicators for the following titrations are,

(i) Strong acid Vs strong base: Phenolphthalein (pH range 8.3 to 10.5), methyl red (pH range 4.4 – 6.5) and methyl orange (pH range 3.2 to 4.5).

(ii) Weak acid Vs strong base: Phenolphthalein.

(iii) Strong acid Vs weak base: Methyl red and methyl orange.

(iv) Weak acid Vs weak base: No suitable indicator can be used for such a titration.

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