Chemical properties of hydrogen compounds of nitrogen

2.1. Put 2 g of the crushed ammonium nitrite into a test tube, add 10 mls of a concentrated ammonium chloride solution, close with a stopper with an exhausting tube and heat carefully. When the air will be replaced from a test tube, collect gas, which evolves in a test tube with a method of replacement of air. How it is necessary to place a test tube? Put a decaying splitter into a test tube with gas. What can you observe? Does it support burning?

2.2. Put 1 g of crystalline ammonium chloride into a dry test tube and add 2 mls of a concentrated sodium hydroxide solution. Heat the mixture for 2-3 minutes. When the air will be replaced from a test tube collect gas, which evolves, in a dry test tube with a method of air replacement. How it is necessary to place the test tube? Then immerse an aperture of the test tube with ammonia in water. Is ammonia dissolved well in water? Why? Add to obtained solution 1-2 drops of a neutral litmus solution. What can you observe?

2.3. Place 1-2 mls of ammonia solution into each of the six test tubes and add 3-4 drops of solutions: of aluminium sulphate into the first, of iron (Ш) chloride into the second, of chrome (ІІІ) chloride into the third, sulphate of nickel (ІІ) in the fourth, sulphate of copper (П) in the fifth, lead acetate (П) in the sixth. How does the solutions colour change? Is the precipitate formed? Give the equations of the relevant reactions and explain, with what the process in each case - reaction of a complexing or exchange flows past?

2.4. Place 1-2 mls of bromine water into a test tube and add 4-5 drops of ammonia solution. What can you observe? What properties does ammonia show in this reaction? Give the equation of the reaction.

2.5. Put few crystals of ammonium chloride into a dry test tube. Keeping the test tube with small inclination, heat it. What can you observe? Does ammonia evolve?

2.6. Place 1-2 mls of bromine water into a test tube and add 4-5 drops of hydrazine solution. What can you observe? What properties does hydrazine show in this reaction? Give the equation of the reaction.

2.7. Place 3-4 drops of 0,5N potassium permanganate solution, 5-6 drops of diluted sulfuric acid into a test tube and add 4-5 drops of hydrazine solution. What can you observe? What properties does hydrazine show in this reaction? Give the equation of the reaction.

Carry out this experiment, taking diluted ammonia solution instead of hydrazine. Does the reaction proceed? Why?

2.8. Place 1-2 mls of copper (ІІ) chloride solution into a test tube and add 3-4 drops of hydrazine. Heat up mixture slightly. What can you observe? What properties does hydrazine show in this reaction? Give the equation of the reaction.

2.9. Place 3-4 drops of 0,5N potassium permanganate solution, 5-6 drops of diluted sulfuric acid into a test tube and add 4-5 drops of hydroxylamine solution. What can you observe? What properties does hydroxylamine show in this reaction? Give the equation of the reaction.

Дата добавления: 2015-11-14