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Updated: May 20, 2025
For example, in the qualitative detection of sulphates by precipitation as barium sulphate from acid solution it is not necessary, in most instances, to take into account the solubility of the sulphate in hydrochloric acid, while in the quantitative determination of sulphates by this reaction this solubility becomes an important consideration.
If any one of these ten elements is lacking, it is impossible to produce a kernel of corn, a grain of wheat, or a leaf of clover; and in the main the supply is under the farmer's own control. But we can discuss this matter more fully later. Let us see what we have here." Percy poured a few drops of the hydrochloric acid into the hollow of the cake of soil. "What should it do?" asked Mr. West.
*Other Effects of the Gastric Juice.*—In addition to digesting proteids, the gastric juice brings about several minor effects, as follows: 1. It checks, after a time, the digestion of the starch which was begun in the mouth by the saliva. This is due to the presence of the hydrochloric acid, the ptyalin being unable to act in an acid medium.
Again moisten the residue with concentrated hydrochloric acid, warm gently, making sure that the acid comes into contact with the whole of the residue, dilute to about 200 cc. and bring to boiling. Allow the filter to drain for a few moments, then place a clean beaker below the funnel and wash with water until free from chlorides, discarding these washings.
*To illustrate the Digestive Process.*—To a tumbler two thirds full of water add a little salt. Stir and observe that the salt is dissolved. Taste the solution to see that the salt has not been changed chemically. Now add a little powdered limestone to the water and stir as before. Observe that the limestone does not dissolve. Then add some hydrochloric acid and observe the result.
When hydrochloric acid is added to bichromate of potash, chromic acid is liberated. Now, chromic acid has the property of precipitating gelatine, so that what I hope to have done is to have precipitated the gelatine in this emulsion, and which will carry down the silver bromide as well.
The alloy consists largely of lactopeptine, hydrochloric acid, and various other efficient digestives which render it innocuous to the most delicate digestion." "Very well, Memnon," I replied, making a wry face, "bring it on. I'll try a little of it, anyhow." I must confess it did not sound inviting, but a guest should never criticise the food that is placed before him.
Weight of sample 1.000 gram; volume of 0.25 N hydrochloric acid required for phenolphthalein end-point, 26.40 cc.; after adding an excess of acid and boiling out the carbon dioxide, the total volume of 0.25 N hydrochloric acid required for phenolphthalein end-point, 67.10 cc. !Answer!: 69.95% Na CO ; 30.02% NaHCO .
Wash the filter five times with water, and finally pour through it aqueous ammonia. Filter off the calcium oxalate upon the filter first used, and wash free from chlorides. The filtrate should be made barely acid with hydrochloric acid and combined with the filtrate from the first precipitation. Begin at once the evaporation of the solutions for the determination of magnesium as described below.
"One part nitric acid, two parts hydrochloric acid," he muttered, pouring the desired quantities from the bottles. These preparations having been made, the Professor's next move was to apply a blowpipe to some of the metal from the pulverized ore, thus forming a small yellow button.
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