The washings are added to the filtrate, and the liquid concentrated in a porcelain capsule.
In the filtrate the free alkali is estimated by a normal acid.
Evaporate the filtrate to a syrup, and extract with successive portions of absolute alcohol.
The liquid is poured on a small dry filter and washed with warm benzoline, the filtrate being collected in a small wide beaker.
Determine the copper in the filtrate colorimetrically (p. 203); but avoid further dilution.
The filtrate can then be subjected to Marsh's or Reinsch's process.
Filter and evaporate the filtrate until the fumes of sulphuric acid begin to be evolved, when 10 gr.
The funnel and vessel used to receive the filtrate must be perfectly dry.
Add phenolphthalein to the filtrate and titrate with N/10 acid and calculate the per cent.
Some filtrate it, but many more drink it, and use it for culinary purposes, in its natural state.
filtrate fil·trate (fĭl'trāt')
v. fil·trat·ed, fil·trat·ing, fil·trates
To put or go through a filter. n.
Material, especially liquid, that has passed through a filter.