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Updated: June 21, 2025
H AsO + MgCl + 3NH OH = MgNH AsO + 2NH Cl + 3H O. !Answer!: 30.71 grams. !Answer!: 25.60 cc. If 0.6742 gram of a mixture of pure magnesium carbonate and pure calcium carbonate, when treated with an excess of hydrochloric acid, yields 0.3117 gram of carbon dioxide, calculate the percentage of magnesium oxide and of calcium oxide in the sample. !Answers!: 13.22% MgO; 40.54% CaO. 92.
Calculate the volume of silver nitrate solution required to effect complete precipitation in each case, and add slowly about 5 cc. in excess of that amount, with constant stirring. The beaker should be covered with a watch-glass, and both boiling and stirring so regulated as to preclude any possibility of loss of material.
Continue to pour in acid until 200 cc. have passed through, then close the stopcock !while a small quantity of liquid is still left in the funnel!. Discard the filtrate, and again pass through 100 cc. of the warm, dilute acid. Test this with the permanganate solution.
In the determination of sulphur in steel by evolving the sulphur as hydrogen sulphide, precipitating cadmium sulphide by passing the liberated hydrogen sulphide through ammoniacal cadmium chloride solution, and decomposing the CdS with acid in the presence of a measured amount of standard iodine, the following data are obtained: Sample, 5.027 grams; cc. Na S O sol. = 12.68; cc.
It should also be remembered that in one case, Deut. ix. 12 in cc. iv and xiv, the same variation is repeated and is also found in Justin. A prisoner, travelling in custody to the place of execution, would naturally not fill his letters with long and elaborate references. The quotations from the Old Testament are as follows: The Epistle to the Ephesians is found also in the Syriac version.
On account of failure to boil out all the excess SO , 38.60 cubic centimeters of 0.1 N KMnO were required to titrate the solution. What was the error, percentage error, and what weight of sulphur dioxide was in the solution? From the following data, calculate the ratio of the nitric acid as an oxidizing agent to the tetroxalate solution as a reducing agent: 1 cc. HNO = 1.246 cc.
In the electrolysis of a 0.8000 gram sample of brass, there is obtained 0.0030 gram of PbO , and a deposit of metallic copper exactly equal in weight to the ignited precipitate of Zn P O subsequently obtained from the solution. What is the percentage composition of the brass? !Answers!: 69.75% Cu; 29.92% Zn; 0.33% Pb. !Answer!: 2.48 cc. !Answer!: 0.83 cc. !Answer!: 0.0152 gram.
Run in the arsenite solution from a burette until no further reaction takes place on the starch-iodide paper when touched by a drop of the solution of bleaching powder. Repeat the titration, using a second 25 cc. portion.
!Answer!: 20.08 cc. !Answer!: 5.70 cc. A sample of pyrolusite weighing 0.6000 gram is treated with 0.9000 gram of oxalic acid. What is the percentage of MnO , in the sample? !Answer!: 84.47%. A solution contains 50 grams of KHC O .H C O .2H O per liter. In the analysis of an iron ore containing 60% Fe O , a sample weighing 0.5000 gram is taken and the iron is reduced with sulphurous acid.
Shake the solution vigorously for a full minute to insure uniformity. Dissolve the hydroxide in water in a beaker. Pour the solution into a liter bottle and dilute, as above, to approximately 1000 cc. This bottle should preferably have a rubber stopper, as the hydroxide solution attacks the glass of the ground joint of a glass stopper, and may cement the stopper to the bottle.
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