15 jobs in analytical chemistry (K / P 1, Var 6 MGTA)

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Uploaded: 05.02.2015
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Task №6
Bring in a real and ionic form the reactions of barium chloride with potassium dichromate. How can I shift the equilibrium reaction Cr2O72 + H2O = 2CrO42 + 2H + in one direction or another? For what purpose was added sodium acetate?

Task №16
What substances are called electrolytes and non-electrolytes? Strong and weak electrolytes. Give examples.

Task №26
How many ml of 2.00 n. nitric acid should take for the preparation of 3 l 0.10 N. the solution?

Task №36
A saturated solution of silver iodide contains 9,1 ∙ 109 mg of AgI in 1 liter at 25 ° C. Calculate the solubility product of the salt (salt of the formula weight of 235.8 g).

Task №46
Calculate pH 0.25% ammonia solution.

Task №56
Calculate the pH buffer mixture consisting of 0.01N. acetic acid and 0.02 N. potassium acetate.

Task №66
What ml of 3% BaCl2 to precipitate the need to take the sulfate ion from 20.0 ml of 0.5% sulfuric acid?

Task №76
Give titration curve solution of formic acid solution of potassium hydroxide. Enter the pH at the equivalence point. Justify the choice of indicator.

Task №86
In the titration of a solution containing 1.0250 g of reagent grade H2C2O4 * 2H2O requires 25.0 mL of sodium hydroxide. Calculate the normality of the titer, and sodium hydroxide, and its titer on oxalic acid.

Task №96
A portion of 0.3950 g of limestone dissolved in 50.00 ml of 0.1295 N. solution of HCl. To titrate the excess acid consumed 10.55 ml of NaOH solution with a titer of 0.004465 g / ml. Calculate the percentage of CaCO3 of the sample.

Setting №106
Under what conditions is performed identification of standard potentials? How to change the value of the redox potential of the system MnO4 + 8H + + 5e = Mn2 + + 4N2O if its solution is added MnSO4?

Setting №116
As determined iodometrically reducing? Describe the example of determination of sodium sulphite Na2SO3. The reactions bring in the real and ion-electronic forms.

Setting №126
Hinge 0.8740 Sodium sulfite is dissolved in a volumetric flask of 250 ml. To 25 ml of this solution was added 50 ml of 0.0450 N. iodine solution, the excess of which is titrated with 25 ml of 0.0500 N. Natia sodium thiosulfate. What percentage Na2SO3 contains a sample?

Setting №136
The volumetric flask 250 ml of a solution 0.7112 g of reagent grade of ammonium oxalate (NH4) 2C2O42N2O. What amount of potassium permanganate, which titer 0.001420 g / ml, the titration will 25.00 ml of the ammonium oxalate solution? (Wednesday acidic.)

Setting №146
Based on what the use of indicators in the adsorption method of deposition?

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