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a. [.K][.....N] Behavior (1) in glass-bulb. Fuses readily to a clear liquid and with a strong heat boils with the evolution of oxygen. (2) in open tube. -- (3) on charcoal. Deflagrates leaving a saline mass, which is absorbed into charcoal and gives a sulphur reaction on silver. (4) in forceps. On platinum wire fuses and colors the flame violet more or less modified by lime and soda. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. With bisulphate of potassa in the glass-bulb evolves nitrous fumes. * * * * * Mineral. Polyhalite Formula. [.K][...S]+[.Mg][...S]+2[.Ca][...S]+2[.H] Behavior (1) in glass-bulb. Gives off water. (2) in open tube. -- (3) on charcoal. Fuses to a reddish bead, which in the reducing flame solidifies and shrinks to a hollow crust. (4) in forceps. On platinum wire fuses and colors the flame yellow from a small quantity of soda. (5) in borax. Dissolves with ebullition to a clear glass, which is slightly colored by iron, and when saturated become opaque on cooling. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses. The alkalies are absorbed by the charcoal leaving the lime and magnesia infusible on the surface. (8) Special reactions. The alkaline mass when laid on silver gives a sulphur reaction. * * * * * SODA. * * * * * Mineral. Rock-salt Formula. NaCl. Behavior (1) in glass-bulb. Fuses to a clear liquid (2) in open tube. -- (3) on charcoal. Fuses, is absorbed by the charcoal and partially volatilized incrusting the charcoal around. (4) in forceps. Fuses with great ease and colors the flame yellow. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions.
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