Allotropes are substances with the same chemical formula but have different forms (e.g. crystal structure). An example of an allotropic pair is aragonite and calcite. The chemical formula of aragonite and calcite is CaCO3. Due to the difference in their crystal structure, their Ksp values are different. The Ksp of aragonite is 6.0×10^(-9) while that of calcite is 3.36×10^(-9). Write the chemical equation for the dissociation of CaCO3 in water. Write the Ksp expression for CaCO3. Which between aragonite and calcite is more soluble? Why?

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.