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vigorously stir. Explain the phenomenon that is observed.
Record the equation of the corresponding reactions.

Sample knowledge control card

Write the structural formulas of the compounds used
in drilling fluids: starch, cellulose, decylamine,
hexadecylammonium chloride; indicate which class they
are, their functional groups, and the role they play in drilling
rigs.

Preparation of some reagents

1. Ammonium complex of argentum. To 5% solution
of nitrogen argentum, add a concentrated ammonia solution
dropwise until dissolution of the argentum hydroxide
precipitate. Excess ammonia should not be added.
2. Aniline (solution in chloride acid). 9.3 g of freshly
3
distilled aniline are dissolved in 22 cm of concentrated
hydrochloric acid. Then dilute with distilled water to 100
ml.
3. Barite water, saturated solution. 70 g of crystalline
barium hydroxide Ba (OH) 2 ∙ 8H 2O is dissolved when
boiling in 200 g of water. Then dilute with water to 1 liter
and allow to settle down. After a few hours, a transparent
layer of fluid is carefully drained.
4. Bromine water. Take 100 cc of distilled water and
add 1 cc of bromine. The mixture is shaken. The work is
carried out in an outlet, where bromine and bromine water
are measured by special cylinders. Bromine water is
carefully poured into a glass with a crusty crust, stored in a
drawer in the desiccator.
5. Ethanol (absolute). In a round-bottom flask pour a
certain amount of ethanol, add a well-fired quicklime so that
its pieces stick to the surface. The total volume of ethanol