15 jobs in analytical chemistry (K / P 1, Var 7 MGTA)

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Uploaded: 05.02.2015
Content: 50205013442340.rar (186,89 kB)

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Task №7
Using acid-base analysis method, specify which connection and why will fall into the sediment and which remain in the solution, if a mixture of cations V and VI of the Fe2 +, Mn2 +, Mg2 +, Cu2 +, Ni2 +, Co2 + act excess NH3? Write the reactions to real and ionic forms.

Task №17
What are electrolytes called strong and weak? What is called the degree of dissociation? Is it a mathematical expression? Write a formula known to you the strong and weak acids and bases and search for reference values \u200b\u200bof dissociation constants.

Task №27
How many ml of 20.0% hydrochloric acid (density of 1.098 g / cm3), you need to take to prepare the five liters of 0.10 n. the solution?

Task №37
Calculate whether the sediment falls PbCl2 (PR = 1,6 ∙ 105) by mixing
0.01 M solution of Pb (NO3) 2 with an equal volume of 0.01 M solution of HCl. If the deposit does not fall PbCl2, what needs to be done to precipitate the lead from the solution?

Task №47
Calculate the pH of a solution obtained by dilution with water 200.0 ml of 12% nitric acid solution to 2000.0 ml.

Task №57
Calculate the pH of the ammonium buffer mixture obtained by mixing 500.0 ml of 0.20 n. ammonia solution 500.0 ml of 0.10 N. hydrochloric acid. .

Task №67
What ml 5% solution of sulfuric acid needed for the precipitation of barium take from a solution containing 0.4859 g of anhydrous BaCl2?

Task №77
What reaction is the basis of the method of acid-base titration? How does the pH of the solution in the titration of a weak acid with a strong base? In what environment is the equivalence point?

Task №87
Calculate titer of hydrochloric acid by sodium hydroxide if the titration of a solution containing 0.2167 g of reagent grade sodium carbonate requires 21.00 ml solution.

Task №97
The sample weight zinc oxide is dissolved in 0.2046 g of 50.00 ml of sulfuric acid with titre of 0.004904 g / ml. Excess acid titrated with 10.00 ml of NaOH solution with a titer of 0.004040 g / ml. Calculate the percentage of ZnO in the sample.

Setting №107
How does the introduction of a solution of ions PO43 and F on the value of redox potential of Fe3 + + e = Fe2 +?

Setting №117
As iodometrically determined content of Cu2 +? Write the equation of chemical reactions in real-ion and electronic forms. As it affects the value of redox potential pair Cu2 + / Cu + precipitation CuI?

Setting №127
In the titration of iodine liberated by treatment with potassium iodide linkage, spent 25.00 ml of sodium thiosulfate solution with a titer of 0.02480 g / ml. How many grams PbO2 contains a sample?

Setting №137
What percentage of the iron contained in the iron wire, if after dissolving 0.1400 g of it into sulfuric acid for titration of the resulting solution consumed 24.00 ml of 0.1000 N. solution KMnO4?

Setting №147
What types of stiffness you know? What is the total hardness of the water? What methods are used to determine the hardness of the water? Write the reactions.

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