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

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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.

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.

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?

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?

Calculate the pH of a solution obtained by dilution with water 200.0 ml of 12% nitric acid solution to 2000.0 ml.

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. .

What ml 5% solution of sulfuric acid needed for the precipitation of barium take from a solution containing 0.4859 g of anhydrous BaCl2?

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?

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.

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.