United States or Jordan ? Vote for the TOP Country of the Week !
One of these parts is in a beaker glass over-saturated with chemically pure chloride of ammonia, whereby any iron of oxide present and a little dissolved alumina fall down as deposit. The precipitate is separated by filtering, washed, dried at 212° Fahrenheit and weighed. To the filtrate is then added a solution of oxalate of ammonia until a white precipitate of oxalate of lime is formed.
A few drops of alcoholic tincture of phenol-phthalein are then added, and as soon as a faint red color appears, addition of soda is stopped. This shows that the fatty acids have been over-saturated. Addition of a little more fat renders them perfectly neutral, and the soap is then ladled out into wooden moulds, lined with loose sheets of zinc.
When the subsoil is temporarily impervious because of its frozen condition, they may become unduly muddy, or, when the situation is such as to lead hill-water upon them, they may be badly washed; but they are free from the great difficulties that beset all roads which for a large part of the year are underlaid by an over-saturated, compact subsoil.
Word Of The Day