- - tubes;
- - tube refrigerator;
- - indicators;
- - acetic acid;
- - isopentyl alcohol;
- - sulfuric acid;
- - sodium hydroxide;
- - iron chloride (III).
The main feature by which you can determine that the vessel is acetic acid, is a characteristic smell of vinegar.To feel the smell, open the bottle and take it over several progressive movements of air with his hand to him.In no case can not be sniffing a volatile liquid, bending low over capacity, as this may result in burns of the mucous membranes of the respiratory tract.
All connections Class acids are composed of hydrogen atoms, which in aqueous solution and determine the acidic properties
.Therefore, this material can be determined using indicators.To do this, take 4 tubes, pour into each 1 ml of acid and lower in these indicators (by-catch, if they as a solution).Litmus in an acid medium turns red, phenolphthalein its color does not change, and methyl orange becomes saturated pink and red.The lower tube 4 universal indicator that will be the solution violet-red.Compare the color on the scale, which is available in each package and see that it corresponds to an acidic environment.
Spend reaction to the presence of acetate ion.To do this, take a test tube, pour into it 2 ml of dilute acetic acid, add 1 ml of sodium hydroxide.It will turn soluble salt - sodium acetate.Now add to the mixture a few drops of ferric chloride (III) - displayed in red color.Heat the mixture, then the reaction of hydrolysis fall brown precipitate.This indicates the presence of acetate ions.
Take a tube put into it 2 ml of the test substance add 2 ml of isopentyl alcohol.Catch in a mixture of 1 mL of concentrated sulfuric acid.Close the test tube tube refrigerator and heat the mixture.The interaction appears pleasant smell of pears due to the formation of the ester.
Tip 2: How to recognize
acetic acid Acetic acid - irreplaceable thing in the kitchen.It is used in everyday cooking and for pickles and other tasty things.Some housewives are using it for cleaning equipment from scale and other business purposes.Recognize acetic acid very simple, and mix it did not turn out.
Smell - peculiar to acetic acid.It is very sharp and Sheba nose.Smelled butylek with concentrated vinegar is close, hold it 10-15 cm away from the nose.If you are close to smell, fumes coming from the liquid can burn the respiratory tract and is a lot of problems.Try not to drip on your hands - will burns.
Acetic acid burns.Pour a little liquid into a small bowl and bring the match, but be careful, you can get burned.Combustion is approximately the same as a normal alcohol.As the evaporation is terminated.If the fire does not happen, you, or apple cider vinegar, or any other liquid, or dilute acid.
characteristic sour taste speaks for itself.But do not try acid directly from the bottle, you can get a strong burns the esophagus.Pour a teaspoon in a glass and dilute at least 20 parts of clean water.Then you can try it, you should feel the sour taste and smell of bluff.In diluted form, it is used for preparation of various sauces.
Unfortunately, at home not conduct any experiments to determine more accurately the substance.Therefore, other experiments leave for professional technicians.And, of course, do not use the substance inside, if you are in doubt about something.Acetic acid is very cheap, so buy a new better than you poisoned unknown composition.
- acetic acid recognize
When the work safety regulations are observed.