The Scientific Foundations of Analytical Chemistry, Treated in An Elementary Manner
The Scientific Foundations of Analytical Chemistry, Treated in An Elementary Manner
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The less, therefore, the acid ionises and the more concentrated the solution of zinc salt is, the less zinc escapes precipitation. Further, since the Ionisation of weak acids can be lowered at will by the addition of their neutral salts, the well-known old method of precipitating zinc in presence of an excess of sodium acetate is thus shown to be theoretically justified.
In order to completely prevent the precipitation of zinc salts by sulphuretted hydrogen, it is necessary to add a suflBcient ...quantity of a strong acid. The free hydrogen ions of this then lower the Ionisation of the hydrogen sulphide to such an extent that the value of the solubility-product is never reached, in spite of there being an abundance of zinc present.
The amount of added acid must of course be approxi- mately proportional to the amount (or rather to the square root of the amount) of the zinc salt.
CHAPTEK X THE MDTALS OF THE COPPER GROUP Gen€7'al Froperties The metals of this group are distinguished from those of the iron one hj the insolubility of their sulphides in dilute strong acids.
What to read after The Scientific Foundations of Analytical Chemistry, Treated in An Elementary Manner?
You can find similar books in the "Read Also" column, or choose other free books by Wilhelm Ostwald to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The less, therefore, the acid ionises and the more concentrated the solution of zinc salt is, the less zinc escapes precipitation. Further, since the Ionisation of weak acids can be lowered at will by the addition of their neutral salts, the well-known old method of precipitating zinc in presence of an excess of sodium acetate is thus shown to be theoretically justified.
In order to completely prevent the precipitation of zinc salts by sulphuretted hydrogen, it is necessary to add a suflBcient ...quantity of a strong acid. The free hydrogen ions of this then lower the Ionisation of the hydrogen sulphide to such an extent that the value of the solubility-product is never reached, in spite of there being an abundance of zinc present.
The amount of added acid must of course be approxi- mately proportional to the amount (or rather to the square root of the amount) of the zinc salt.
CHAPTEK X THE MDTALS OF THE COPPER GROUP Gen€7'al Froperties The metals of this group are distinguished from those of the iron one hj the insolubility of their sulphides in dilute strong acids.
What to read after The Scientific Foundations of Analytical Chemistry, Treated in An Elementary Manner?
You can find similar books in the "Read Also" column, or choose other free books by Wilhelm Ostwald to read onlineMoreLess
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