Boric Acid TB
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Italy
Known as an Italian recipe, with similar versions prepared across other nations.
Ingredients 2 ingredients
- 5 ml must
- 500 ml distilled water
Method
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- Dissolve 5 g boric acid in 500 ml distilled water in a 1,000-ml measuring flask.
- Add 25 ml alcoholic indicator solution (67 mg methyl red and 33 mg brcmocresol green in 100 ml 96% ethanol) and 200 ml ethanol.
- Make up to volume with distilled water.
- The boric acid indicator solution is red.
- 5 ml must turn green with not more than 3 drops of 0.01 N NaOH.
- (About 0.1 N bromine) (7.991 g Br per litre) .
- Dissolve 3 g of potassium brcmate (KBrO^) and 15 g of potassium bromide (KBr) in sufficient water to make 1,000 ml and standardize the solution as follows: transfer about 25 ml of the solution, accurately measured, into a 500-ml iodine flask and dilute with 120 ml of water.
- Add 5 ml of hydrochloric acid, stopper the flask and shake it gently.
- Then add 5 ml of potassium iodide TS, re-stopper, shake the mixture, allow it to stand for 5 min and titrate the liberated iodine with 0.1 N sodium thiosulfate, adding starch TS near the end of the titration.
- Calculate the normality.
- Store this solution in a dark amber coloured, glassstoppered bottle.