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By William Robert Fearon (Auth.)

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On addition of water, or other ionising solvents, ionisation takes place to a n extent deter­ mined by the strength of the acid. Strong acids are almost com­ pletely ionised ; weak acids, except in great dilution, are only partially ionised. ) the dissociation constant of t h e acid, K, which is the product of the concentrations of both component ions, [H] X [A], divided by the concentration of the unionised molecules of acid, [HA]. Acid. Ions Liberated. Hydrochloric Sulphuric Sulphurous . Phosphoric Acetic .

Of phosphorus. Of this, 600 gm. are in the skeleton, 57 gm. in muscle, 5 gm. in nerve tissue, and 2 gm. in the blood. The phosphorus content of milk varies greatly with species of animal, and rate of formation of the young skeleton ; averge values are : human milk, 0-05 ; cow's milk, 0-18 ; expressed as percentage phosphoric acid. The daily output of the human adult varies from 0-3 gm. , two-thirds of this is excreted by the kidney. The value for inorganic urinary phosphorus ranges, in man, from about 30 to 200 mg.

It is greatest in leaves and in skins of fruits. The fluorine content of sea water is about 1*4 mg. per litre, and the halogen is a frequent micro-constituent of marine organisms. Higher animals contain fluorine in skeletal tissue and viscera. Values range from 2 mg. in human brain and lung up to 15 mg. in kidney tissue, expressed as mg. F per kg. dry material. Egg yolk contains about 11 mg. per kg. of fluid. Fresh human bone contains 150-560 mg. , the maximum being in dentine. Tooth substance has been reported to contain 0-2-0-8 per cent.

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