The principal mineral component of limestone is a crystalline form of calcium carbonate known as calcite. Although calcite crystals belong to the trigonal crystal system, shown below, a wide variety of crystal shapes are found. Single calcite crystals display an optical property called birefringence double refraction. This strong birefringence causes objects viewed through a clear piece of calcite to appear doubled.
Another mineral form of calcium carbonate is called aragonite. Its crystal lattice differs from that of calcite, resulting in a different crystal shape — an orthorhombic system with needle-shaped crystals. Calcium carbonate is unusual in that its solubility increases as the temperature of the water decreases. The increased solubility of calcium carbonate in rainwater saturated with carbon dioxide is the driving force behind the erosion of limestone rocks, leading to the formation over long periods of time of caverns, caves, stalagmites and stalactites.
Rainwater is weakly acidic, and when it meets with limestone, some of the calcium carbonate reacts to form a solution of calcium bicarbonate. You've already subscribed with this email. By entering your email address you agree to our Privacy Policy. Bloggers and marketing: marketing melscience. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Ask Question. Asked 5 years, 8 months ago.
Active 4 years, 7 months ago. Viewed 18k times. Improve this question. When something is stable, it should have less energy. When HCl reacts with calcium carbonate, calcium chloride and carbon dioxide gas are given. When you are said to write balanced equation, remember that to write physical properties of compounds. Both carbonates are not insoluble in water and form white precipitates. Calcium carbonate and zinc carbonate reacts with dilute hydrochloric acid and emit carbon dioxide gas form colorless solutions.
CaCl 2 and ZnCl 2 are colorless solutions. But, treating hydrogen sulfide gas to calcium chloride and zinc chloride can be used to identify solutions.
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