QUESTION 8 ooc Inmaking is doing a reaction where tha expected endpoint pH a 3.1

Question

QUESTION 8 ooc Inmaking is doing a reaction where tha expected endpoint pH a 3.1 and he needs o decide wich indeaners would accurateay show the mapori pH wid Indicator skil module. Help Doc chooae A th POSSIBLE indcators Thymol blue (acid range) Bromphenol blue Methyl orange Brom cresol green Mathyl red Thymol blue (basic range) Phenolphthalein QUESTION 9 Doc wants to place the indicator in his basic solution and add the acid until the endpoint is reached Help Doc choose the ONE ndicator situation (see Question Methyl violet

Explanation / Answer

The Ph ranges of given indicators are

Methyl violet - 0.0 to 6.6

Thymol blue (acid range) - 1.2 to 2.8

Bromopheno lblue - 3.0 to 4.6

Methyl orange - 3.1 to 4.4

Bromocresol green - 3.8 to 5.4

Methyl red - 4.2 to 6.3

Thymol blue (basic range) - 8.0 to 9.6

Phenolpthalein - 8.3 to 10

Hence the suitable indicators to get the end point of the titration at PH = 3.7 are Bromophenolblue and methyl orange.

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