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Calcium Carbonate

The table on the right shows the result for Ca 2 and H (in the form of p H ) as a function of ambient partial pressure of CO 2 ( K sp = 4.47 10 9 has been taken for the calculation). At atmospheric levels of ambient CO 2 the table indicates the solution will be slightly alkaline. Weak acids such as acetic acid will react, albeit less vigorously. This reaction is important in the erosion of carbonate rocks, forming caverns, and leads to hard water in many regions. Alternatively, calcium oxide is prepared by calcining crude calcium carbonate. The main use of calcium carbonate is in the construction industry, either as a building material in its own right (e.g. marble ) or limestone aggregate for roadbuilding or as an ingredient of cement or as the starting material for the preparation of builder s lime by burning in a kiln. For vanishing acid concentrations, we recover the final p H and the solubility of CaCO 3 in pure water.

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