|
|Section2= |Section3= |Section5= |Section6= |Section7= |Section8= }} Magnesium hydroxide is an inorganic compound with the chemical formula of hydrated Mg(OH)2. It is often known as milk of magnesia, because of its milk-like appearance as a suspension. While magnesium hydroxide has a low solubility in water, with a Ksp of 1.5×10−11, it is large enough that it will partially dissolve to produce ions in the solution, forming the suspension. A relatively high concentration of magnesium or hydroxide ions would be required to revert the suspension to the solid precipitate by reversing the equilibrium. In this suspended form, magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. The antacid properties come from the hydroxide ions which are responsible for neutralising the acid. The solid mineral form of magnesium hydroxide is known as brucite. ==History== On May 4, 1818, an American inventor named John Callen, received a patent (No. X2952) for magnesium hydroxide 〔 (Patent USX2952 - Magnesia, medicated, liquid - Google Patents )〕 In 1829, Sir James Murray used a fluid magnesia preparation of his own design to treat the Lord Lieutenant of Ireland, the Marquis of Anglesey, of stomach pain. This was so successful (advertised in Australia and approved by the Royal College of Surgeons in 1838)〔(Sir James Murray's condensed solution of fluid magnesia ), The Sydney Morning Herald – October 7, 1846〕 that he was appointed resident physician to Anglesey and two subsequent Lords Lieutenants, and knighted. His fluid magnesia product was patented two years after his death in 1873.〔(Ulster History. Sir James Murray – Inventor of Milk of Magnesia. 1788 to 1871 ), 24 February 2005〕 The term ''milk of magnesia'' was first used for a white-colored, aqueous, mildly alkaline suspension of magnesium hydroxide formulated at about 8%w/v by Charles Henry Phillips in 1872 〔(When was Phillips' Milk of Magnesia introduced? )〕 and sold under the brand name ''Phillips' Milk of Magnesia'' for medicinal usage. Although the name may at some point have been owned by GlaxoSmithKline, USPTO registrations show "Milk of Magnesia" 〔(results from the TARR web server: Milk of Magnesia )〕 and "Phillips' Milk of Magnesia"〔(results from the TARR web server: Phillips' Milk of Magnesia )〕 both registered to Bayer. In the UK, the non-brand (generic) name of "Milk of Magnesia" and "Phillips' Milk of Magnesia" is "Cream of Magnesia" (Magnesium Hydroxide Mixture, BP). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「magnesium hydroxide」の詳細全文を読む スポンサード リンク
|