Ferric Nitrate

Ferric Nitrate, Fe(NO3)3•9H2O

Caution

Observe safety precautions for handling concentrated acids.
Wear eye protection and impervious gloves. Use caution and always add acid slowly to water. Corrosive to skin, metals, and clothing. Avoid contact with liquid and vapor. Use an exhaust hood.

Preparation

0.10 M Acidified Ferric Nitrate

Add cautiously 40 mL of colorless, reagent-grade concentrated nitric acid to 400 mL of distilled water contained in a 1-litre volumetric flask. If the acid is colored, bubble nitrogen or air through it, before diluting, until the brown color has entirely disappeared.
Dissolve 40.0 g of reagent-grade ferric nitrate, in the diluted acid; dilute to 1 litre 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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Ferric Nitrate

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Starch Solution

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