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the water levels in the burette 5 and cylinder 6. When levels are in one
horizontal plane close the valve 8 and take counting out on the burette
scale.
5.4.5 Carefully incline the bottle 2 and pour 1/3 part of the acid

from the test tube. Carbon dioxide which is released in the result of
reaction displaces water out from the burette into the annular space
between cylinder and burette. For equalizing the water levels in

the burette and cylinder on one mark put down the bottle 7, open the
valve 8 and pour the part of water from cylinder into the bottle 7. This
operation should be repeated till the stop of release of carbon dioxide.
5.4.6 At the end of reaction determine the water level in the

burette and compare it with the initial one.
5.4.7 Note the thermometer 9 counting and the magnitude of

atmospheric pressure for determining the gas density under conditions

of the experiment.

5.4.8 Determine the rock carbonate content (in %) by the

equation:

V 
K  , (5.2)
4 . 4  G
where V is the volume of CО which was released in the result of
2
3
reaction of the acid with rock, сm ; G is the weight of tеsted rock
sample, g; ρ is the density of СО under conditions of the experiment,
2
3 3
mg/cm (kg/m ), which could be determined by the equation:

4 4 P 
  atm , (5.3)
6 . 2 36 t (  273 )

where P is atmospheric pressure, mm. merc. сol.; t is temperature

atm
under conditions of the experiment, °С.
5.4.9 Put the results of experiments into table 5.1 and calculate

the magnitude of rock carbonate content (in %). Draw the conclusion.

5.5 Checking questions

5.5.1 Give the definition of the rock carbonate content.
5.5.2 Write the equation for determining the rock carbonate
content. Give identification of all symbols in the equation and units of

measurement.
5.5.3 Explain how is the magnitude of the rock carbonate content

got by the equation (5.2) – in fractions or in %? What is the chemical
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