An Introductory Course in Quantitative Chemical Analysis With Explanatory Notes
An Introductory Course in Quantitative Chemical Analysis With Explanatory Notes
George Mcphail Smith
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Oooo g. ; weight after heating (water driven off), 0. 8522 g. ; weight of silver chloride ob- 170 INTRODUCTORY COURSE IN QUANTITATIVE ANALYSIS tained, i . 1 73 5 g. ; weight of barium sulphate obtained, 0. 9594 g. Calculate : (a) the percentage of each constituent ; (6) the formula of the compound. 41. If two i. Oooo-g. Samples of a substance containing 10. 00% of MgO are weighed out, and the precipitate of MgNH 4 PO 4 . 6 H 2 is in one case contaminated with 0. 0250 g. Of Mg 3 (PO 4 )2, and in... the other case with 0. 0250 g. Of Mg[(NH 4 ) 2 P04]2, what percentages of MgO will be found if the calculations are based upon the assumption that the ignited precipi- tate in each case consists entirely of Mg 2 P2O7? 42. The carbonates of calcium, strontium and barium obtained from a lo-liter sample of mineral water are converted into the anhydrous nitrates, and the calcium nitrate is extracted with absolute alcohol-ether mixture. The residue is dissolved in water, the barium separated from the strontium, as BaCr0 4, and the strontium precipitated from the nitrate with sulphuric acid and alcohol.
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