Carr-Price reagent

Weigh an unopened bottle of antimony trichloride. Open the bottle and empty the contents into a wide mouth glassstoppered amber bottle containing about 100 ml of chloroform. By difference, obtain the weight of antimony trichloride and then add sufficient chloroform to supply 100 ml for each 25 g. Dissolve by warming or shaking for several hours and filter through sodium sulphate into a dry clean amber bottle with ground stopper.Store at room temperature and keep in dark when not in use. Rinse all glassware coming into contact with this reagent wit chloroform or a mixture of ethanol and ether, since the antimony oxychloride which forms is insoluble in water.

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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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Carr-Price reagent

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Reagent of the Day

Starch Solution

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