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!Answers!: 24.50% NaOH; 64.92% Na CO . From the following data, calculate the percentages of Na CO and NaHCO in an impure mixture.
The young doctor went very much into details, even so far as giving the various chemical symbols of poison, dwelling long on arsenious acid, whose symbol, he told the reporter, was As2O5, while if one desired to test the organs for traces of strychnine, it would be necessary to use "sodium and potassium hydroxide, ammonia and alkaline carbonate, to precipitate the free base strychnine from aqueous solutions of its salts as a white, crystalline solid," while this imposing formula was given: "C21H22 + NaOH C21H22 + H20 + NaNO3."
Calculate the percentage of potassium oxide in an impure sample of potassium carbonate from the following data: Weight of sample = 1.00 gram; HCl sol. used = 55.90 cc.; NaOH sol. used = 0.42 cc.; 1 cc. NaOH sol. = 0.008473 gram of KHC O .H C O .2H O; 2 cc. HCl sol. = 5 cc. NaOH sol. !Answer!: 65.68%. NaOH solution = 1.190 cc. HCl solution. !Answer!: 97.97%.
It was, besides, dictated by a strong suspicion, if not a full assurance, that he had attained the object of his journey. She gave a prompt and kind answer: "I am the daughter of Bethuel, the son of Milcah, which she bare unto Naoh.
Two hundred cubic centimeters of this filtrate require 29.62 cc. of 0.1062 N hydrochloric acid for neutralization, using phenolphthalein as an indicator. Calculate percentage of NaOH, Na CO , and H O. !Answers!: 78.63% NaOH; 4.45% Na CO ; 16.92% H O.
A student standardized a solution of NaOH and one of KMnO against pure KHC O .H C O .2H O and found the former to be 0.07500 N as an alkali and the latter exactly 0.1 N as an oxidizing agent. By coincidence, exactly 47.26 cc. were used in each standardization. Find the ratio of the oxalate used in the NaOH standardization to the oxalate used in the permanganate standardization. !Answer!: 1:1.
It is desired to dilute a solution of hydrochloric acid to exactly 0.05 N. The following data are given: 44.97 cc. of the hydrochloric acid are equivalent to 43.76 cc. of the NaOH solution. How many cc. of water must be added to 1000 cc. of the aqueous hydrochloric acid? !Answer!: 11 cc.
NaOH solution; 1 cc. NaOH = 1.743 cc. KHC O .H C O .2H O solution; Normal value NaOH = 0.12. !Answer!: 4.885. Given the following data: 25 cc. of a hydrochloric acid, when standardized gravimetrically as silver chloride, yields a precipitate weighing 0.5465 gram. 24.35 cc. of the hydrochloric acid are exactly equivalent to 30.17 cc. of KHC O .H C O .2H O solution.
A chemist received four different solutions, with the statement that they contained either pure NaOH; pure Na CO ; pure NaHCO , or mixtures of these substances. From the following data identify them: Sample I. On adding phenolphthalein to a solution of the substance, it gave no color to the solution.
Sample IV. On titrating with hydrochloric acid, using phenolphthalein, 15.00 cc. were required. A new sample of the same weight required exactly 30 cc. of the same acid for neutralization, using methyl orange. In the analysis of a sample of KHC H O the following data are obtained: Weight sample = 0.4732 gram. NaOH solution used = 24.97 cc. 3.00 cc.
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