The same inEnglish

Definition of the Lime Percentage in the soil

Materials:

Different kinds of soil (5 different), 3,75% Hydrochloric acid, Petri plates, spoon, Pipette

Experimental setup:

You give a part of a soil sample on a Petri plate. Now you make the part of the soil sample smaller with the spoon. Now you do on the soil sample a drip of the Hydrochloric acid with the Pipette.

Observation:

The different soil samples foamed in touch with the Hydrochloric acid different strong.

Soil Sample 1 weakly foaming

Soil Sample 2 weakly foaming

Soil Sample 3 clearly, but briefly foaming

Soil Sample 4 no foaming

Soil Sample 5 weakly foaming

Result:

As weaklier the soil sample is foaming, as smaller is the lime percentage in it.

No foaming till 1%

Weakly foaming 1%-3%

Clearly, but briefly foaming 3%-5%

Continuously foaming over 5%

Because of:

Lime + hydrochloric acid à carbon dioxide + calcium chloride + water

CaCO₃ + 2HCL aq à CO₂ + CaCl₂ +H₂O