Exercises in Elementary Quantitive Chemical Analysis for Students of Agriculture
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It is necessary, therefore, to break up these complexes. This can be done by the addition of potassium sulphide.
3. If the sodium hydroxide solution is mixed at once with the contents of the Kjeldahl flask, the solution will become so hot that there will be danger of loss of ammonia by volatilization. Great care should be exercised at this point, and the flask should be con- nected with the condenser as soon after the addition of the alkali as possible. As there is danger of " bumping " when th...e flasks are heated, a few pieces of granulated zinc are usually added just before the addition of the alkali, which prevent bumping by dissolving in the alkali with the liberation of hydrogen, which keeps the solution stirred. Fragments of ignited pumice stone will also prevent bumping.
4. In the determination of the blank, the function of the sugar is to reduce any nitrates which might be present in the reagents.
5. The Kjeldahl method for the determination of nitrogen finds wide apphcation in the analysis of agricultural products.
What to read after Exercises in Elementary Quantitive Chemical Analysis for Students of Agriculture?
You can find similar books in the "Read Also" column, or choose other free books by Azariah Thomas Lincoln to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is necessary, therefore, to break up these complexes. This can be done by the addition of potassium sulphide.
3. If the sodium hydroxide solution is mixed at once with the contents of the Kjeldahl flask, the solution will become so hot that there will be danger of loss of ammonia by volatilization. Great care should be exercised at this point, and the flask should be con- nected with the condenser as soon after the addition of the alkali as possible. As there is danger of " bumping " when th...e flasks are heated, a few pieces of granulated zinc are usually added just before the addition of the alkali, which prevent bumping by dissolving in the alkali with the liberation of hydrogen, which keeps the solution stirred. Fragments of ignited pumice stone will also prevent bumping.
4. In the determination of the blank, the function of the sugar is to reduce any nitrates which might be present in the reagents.
5. The Kjeldahl method for the determination of nitrogen finds wide apphcation in the analysis of agricultural products.
What to read after Exercises in Elementary Quantitive Chemical Analysis for Students of Agriculture?
You can find similar books in the "Read Also" column, or choose other free books by Azariah Thomas Lincoln to read onlineMoreLess
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