Indicators And Test Papers Their Source Preparation Application And Test for
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The acid radicals of all the alkaloids excepting coniine, nicotine, and codeine, may also be estimated.
Phenolphtalein is excellent for estimating the organic acids, such as oxalic, acetic, tartaric, citric, lactic, etc. , and particularly in mixtures of alcohol and ether, in which many organic acids which are insoluble in water may be readily titrated. It is best to titrate the organic acids in cold or only moderately warm solutions when using potassium- or sodium hydrate as a titrating fluid.... The indi- cator is also exceedingly useful for titrating fatty acids in alcoholic solution, and for free alkali in soap where litmus is inapplicable.
The indicator can be used with only those metals that yield white precipitates with sodium sulphide or with a carbonate of an alkali. It is also useful in many cases where the solutions to be titrated are colbred, because in these the color-changes may be quite readily observed.
It has 'been pointed out by Messrs. N. And C. Draper that the color of phenolphtalein solutions colored red by potassa or soda is partially discharged on the addition of alcohol, the reason ascribed being the formation of some bicarbonate by taking up carbonic acid from the air.
What to read after Indicators And Test Papers Their Source Preparation Application And Test for?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Isaac Cohn to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The acid radicals of all the alkaloids excepting coniine, nicotine, and codeine, may also be estimated.
Phenolphtalein is excellent for estimating the organic acids, such as oxalic, acetic, tartaric, citric, lactic, etc. , and particularly in mixtures of alcohol and ether, in which many organic acids which are insoluble in water may be readily titrated. It is best to titrate the organic acids in cold or only moderately warm solutions when using potassium- or sodium hydrate as a titrating fluid.... The indi- cator is also exceedingly useful for titrating fatty acids in alcoholic solution, and for free alkali in soap where litmus is inapplicable.
The indicator can be used with only those metals that yield white precipitates with sodium sulphide or with a carbonate of an alkali. It is also useful in many cases where the solutions to be titrated are colbred, because in these the color-changes may be quite readily observed.
It has 'been pointed out by Messrs. N. And C. Draper that the color of phenolphtalein solutions colored red by potassa or soda is partially discharged on the addition of alcohol, the reason ascribed being the formation of some bicarbonate by taking up carbonic acid from the air.
What to read after Indicators And Test Papers Their Source Preparation Application And Test for?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Isaac Cohn to read onlineMoreLess
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