Filter-paper sentence example
- The residue on the filter paper gives (3) the substances insoluble in water.
- (a) Gravimetric. - This method is made up of four operations: (I) a weighed quantity of the substance is dissolved in a suitable solvent; (2) a particular reagent is added which precipitates the substance it is desired to estimate; (3) the precipitate is filtered, washed and dried; (4) the filter paper containing the precipitate is weighed either as a tared filter, or incinerated and ignited either in air or in any other gas, and then weighed.
- a filter paper which has been previously heated to the temperature at which the substance is to be dried until its weight is constant.
- It is washed by ejecting a jet of water, ammonia or other prescribed liquid on to the side of the filter paper until the paper is nearly full.
- (4) After washing, the funnel containing the filter paper is transferred to a drying oven.Advertisement
- If the precipitate may be ignited, it is transferred to a clean, weighed and recently ignited crucible, and the filter paper is burned separately on the lid, the ash transferred to the crucible, and the whole ignited.
- The liquid to be filtered is poured into the cone, preferably down a glass rod upon the sides of the funnel to prevent splashing and to preserve the apex of the filter-paper, and passes through the paper, upon which the solid matter is retained.
- A fragment thrown on the surface of water rapidly disengages hydrogen, which gas, however, does not inflame, as happens with potassium; but inflammation occurs if hot water be used, or if the metal be dropped on moist filter paper.
- It is then allowed to stand twenty-four hours, filtered, washed with dilute ammonia, dried, ignited to constant weight and weighed, the filter paper being incinerated separately after moistening with nitric acid.
- They are odourless and tasteless, and some yield clear aqueous solutions - the real gums - while others swell up and will not percolate filter paper - the vegetable mucilages.Advertisement
- Leave the Petri dish flat for a few minutes to allow the seeds to adhere to the damp filter paper.
- Gel filter paper is typically used in theater production for colored lighting.
- The sweat is absorbed onto a piece of filter paper and is then analyzed for its salt content.
- In some cases the doctor may order a filter paper or glucose content test of nasal secretions to check for the presence of cerebrospinal fluid.
- A dry piece of filter paper is taped to the area where the pilocarpine was applied.Advertisement
- The filter paper is called a sweat patch.