15 jobs in analytical chemistry (K / P 1, Var 2 MGTA)

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Uploaded: 07.06.2013
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Task №2
What is the essence of the fractional method of analysis? Give an example of fractional reaction detection cation.

Task №12
What is the essence of the theory protolytic BrenstedaLouri? Give examples of acids, bases.

Task №22
Calculate the molarity of 20% sulfuric acid solution whose density is 1.14 g / cm3.

Task №32
Calculate solubility BaCrO4 in g / dm3: 1) in water; 2) 0.10 M solution K2CrO4.

Task №42
Calculate the pH of a solution containing 1.20 g of acetic acid in 200.0 ml of solution.

Task №52
Calculate the pH of the ammonium buffer mixture prepared by dissolving 3.20 g of ammonium nitrate in 100.0 ml of 0.1N. ammonia solution.

Task №62
What ml 5% solution of calcium chloride is necessary to take deposition of fluoride ion linkage 0.7956 g sodium fluoride?

Task №72
What is the jump of the titration? As using the titration curve, to choose the right light?

Task №82
For preparation of standard solution of sodium carbonate have weighed 1.3250 g reagent grade Na2CO3, it was dissolved and the solution was diluted with water in a volumetric flask to a volume of 250 ml. Calculate titer of sodium carbonate with hydrochloric acid.

Task №92
A weighed sample of 2.2418 g of a sodium tetraborate were dissolved in a volumetric flask, 100.0 ml. To titrate this solution 20.00 ml 25.50 ml spent hydrochloric acid titer by sodium hydroxide 0.003974 g / ml. Calculate the percentage of reagent grade Na2B4O710N2O sodium tetraborate solution.

Setting №102
As the redox potential value depends on the ratio of the concentration of the oxidized and reduced forms and the concentration of hydrogen ion?

Setting №112
What is the effect of Mn 2+ ions have on the rate of oxidation of oxalate potassium permanganate? Give the reactions.

Setting №122
The volumetric flask 250 ml of solution weighed 1.4425 g of a sodium nitrite. To titrate 20 ml of the spent solution 25.00 ml with a titer of KMnO4 0.001520 g / ml. Determine the percentage of NaNO2 in the sample.

Setting №132
To 25.00 mL of chlorinated water added an excess of potassium iodide. On titration of liberated iodine consumed 20.10 ml of 0.1100 N. sodium thiosulfate. How many grams of chlorine bleach containing 1 liter of water?

Setting №142
What is the essence rodanometricheskogo determination of chlorine? Enter the titrant, and pH indicator. Write the reactions. What are the advantages of this method compared with the method of Mora?

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