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Then run in the permanganate solution from a pipette or burette to determine roughly the amount required. Strong sulphuric acid also decomposes the oxalic acid. The excess of ferrous iron may also be determined by titration with potassium bichromate, if desired. The chlorine generated by the pyrolusite is passed into a solution of potassium iodide.

!Standard Acid Solutions! may be prepared from either hydrochloric, sulphuric, or oxalic acid.

Spread this over the marble; let it lie half an hour; wash it off with soap-suds; wipe dry with flannel. Repeat if necessary. Stains that cannot be removed in any other way may be tried with oxalic acid water; but this should be used carefully, and not allowed to remain long at a time. Use salt in the water, and wipe dry.

It is only necessary to heat the nitric acid on the sugar; the sugar dissolves, and there is a violent effervescence, which must be moderated by immersion in cold water: when the mixture cools, crystals of oxalic acid form in abundance, which may be purified by a second crystallization.

When the precipitate is dried and heated on platinum-foil, it disperses as white vapour with slight detonation. Sulphate of lime in excess gives a white precipitate, soluble in nitric or hydrochloric acid, but insoluble in oxalic, tartaric, acetic, or any vegetable acid.

Oxalic acid, or salt and lemon juice are good, and care should be taken to rinse the articles well after the application. Herbs, Gardens and Yards. If you have a garden, be careful to raise herbs, both for cooking and to use in sickness.

Nearly went into hysterics myself. Humpo slopping his tongue round his jaws, watching him like a dog watching its dinner being cut up. After about two years, slaps in his tongue and demands, 'Come, sir, for what purpose did you buy this oxalic acid? "Sabre gives his first clear, calculated words since he had got up there. I guess he had been pulling himself together to look for a trap.

This reacts with the oxalic acid, setting free carbonic acid, which, in turn, forms sodium bicarbonate with the remaining carbonate: H CO + Na CO > 2HNaCO . If, however, the solution is heated to boiling, the bicarbonate loses carbon dioxide and water, and reverts to sodium carbonate, which causes the indicator to become again pink: 2HNaCO > H O + CO + Na CO .

When sweeping carpets and dusting walls always cover the furniture until the particles of dust floating in the air settle, then remove the covers, and wipe with a silk or soft cotton cloth, Rub stains on furniture with cold-drawn linseed oil; then rub with alcohol. Remove ink stains with oxalic acid and water; wash off with milk.

Of all the wares and commodities in exchange and barter, wherein so mainly consists the civilization of our modern world, there is not one which is so carefully weighed, so accurately measured, so plumbed and gauged, so doled and scraped, so poured out in minima and balanced with scruples, as that necessary of social commerce called "an apology"! If the chemists were half so careful in vending their poisons, there would be a notable diminution in the yearly average of victims to arsenic and oxalic acid.