A short manual of analytical chemistry, qualitative and quantitative,--inorganic and organic . PRECIPITA TION—DECANTA TION—FILTRA TION. acid tartrate. When it is desirable to cause precipitates to form quickly,resort may be had to violent shaking, or stirring with a glass rod, so that itscrapes against^the sides of the vessel. In qualitative analysis precipitation is usually conducted in test-tubes,shown in fig. 3. These are kept in a stand (fig. 4) having holes for thereception of tubes actually in use, and also a row of pegs upon which freshly-. Vig. 3. Fig. 4- Fig. 5- Fig. 6. washed tubes m
A short manual of analytical chemistry, qualitative and quantitative,--inorganic and organic . PRECIPITA TION—DECANTA TION—FILTRA TION. acid tartrate. When it is desirable to cause precipitates to form quickly,resort may be had to violent shaking, or stirring with a glass rod, so that itscrapes against^the sides of the vessel. In qualitative analysis precipitation is usually conducted in test-tubes,shown in fig. 3. These are kept in a stand (fig. 4) having holes for thereception of tubes actually in use, and also a row of pegs upon which freshly-. Vig. 3. Fig. 4- Fig. 5- Fig. 6. washed tubes may be inverted to drain. Figure 5 illustrates the applianceused to hold tubes when their contents are to be boiled, and fig. 6 shows thebrush used for cleansing them. In quantitative analysis precipitation is generally performed in are very thin tumblers made of glass, free from lead, and annealed soas to permit their use with boiling liquids without risk of fracture. Precipitates are separated from the supernatant liquor by one of twomethods. First:— IV. DECANTATION, which consists in allowing the precipitate to settle tothe bottom, and pouring off the clear liquor. This isbest done by the use of a glass rod held as shown in theillustration, fig. 7. Second:—
Size: 3008px × 831px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectchemistryanalytic
