m-Cresol Purple Indicator

Meta Cresol Purple, m-cresolsulfonphthalein

Color change: Yellow to purple
pH: 7.4 to 9.0

Preparation

Grind 0.1 g of m-cresolsulfonphthalein in a mortar
with 26.2 mL of 0.01 N sodium hydroxide.
Dilute to 250 mL with distilled water and mix.

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Starch Solution

Triturate 0.5gm. of soluble starch with a little cold water into a thin paste and add 25ml. of boiling water.Boil until a clear solution is obtained (5-mins.). This solution should be freshly prepared as required. A more stable starch solution is obtained by adding 0.5gm. of potassium iodide and 2-3 drops of chloroform. A more satisfactory starch solution for use as an indicator is prepared as follows:* Mix 5.0 gm.of powdered sodium starch glycollate with 1-2 ml. ethyl alcohol, add 100ml. of cold water and boil for a few minutes with stirring.This 5% stock solution is stable for many months; it is diluted to 0.1% strength when required for use..=

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m-Cresol Purple Indicator

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Reagent of the Day

Starch Solution

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