chemical reagents their purity and tests by E. Merck, Henry Schenk

By E. Merck, Henry Schenk

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At most only a faint yellow, but in no case a brownish-red, color or precipitate should form. ACID SULPHURIC, FUMING, WITH PHOSPHORIC ANHYDRIDE APPROXIMATELY 5, 10, 15, 20, OR 25% P2O5 Fuming sulphuric acid containing phosphorus pentoxide; the usual grades contain approximately 5, 10, 15, 20, or 25 per cent of P2OS. The preparation is used in Kjeldahl's nitrogen determination. TEST OF PURITY Nitrogen. — The nitrogen determination is carried out as described under Acid Sulphuric, Fuming. See footnote there.

Of water, and adding 1 cc. of hydrochloric acid, followed by barium chloride solution, a precipitate of barium sulphate should hot form on standing twelve hours. Hydrochloric Acid. — The mixture obtained by diluting 5 cc. of perchloric acid with 25 cc. of water and adding 3 cc. 26 CHEMICAL HtiMiKNTS of nitric acid should not be rendered more than slightly turbid by silver nitrate solution. Barium. — 10 cc. of perchloric acid diluted with f>0 e<\ of water must not become turbid within five minutes on" adding dilute sulphuric acid.

Of arsenic-free, granulated zinc, and diluted (1:5) sulphuric acid. A mixture of 3 cc. of phosphoric acid with 20 cc. of water is then introduced in small quantities at a time, the evolution of hydrogen being maintained for about two hours. A deposit of arsenic should not be visible in the reduction tube within these two hours. Quantitative Determination. — Dilute 1 gm. of phosphoric acid with 30 cc. * At least 17 cc. of normal alkali must be added to produce the red color. 1 cc. 04901 gm. of H 3 PO 4 , log.

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