POTASSIUM AND ITS COMPOUNDS.
Examine K, KCl, K2SO4, K2CO3, KOH, HKCO3, KCLO3, KCN.
244. Occurrence and Preparation.-Potassium occurs only in combination, chiefly as silicates, in such minerals as feldspar and mica. By their disintegration it forms a part of soils from which such portions as are soluble are taken up by plants. The ashes of lan