| 21. | Printing and writing paper can contain 10 20 % calcium carbonate.
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| 22. | Corals adapt and modify their environment by forming calcium carbonate skeletons.
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| 23. | They are oval structures densely packed with elliptical calcium carbonate crystals.
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| 24. | Carbonates are deleterious as they readily stick to the boiler apparatus.
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| 25. | It is a deposit of calcium carbonate, as with travertine.
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| 26. | Sodium carbonate is also used in the production of sherbet powder.
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| 27. | White Jurassic may be as pure as 99 % calcium carbonate.
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| 28. | Typical carbonated soft drinks such as colas do have health risks.
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| 29. | Cyanate then hydrolyses in the water to ammonium and carbonate ions.
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| 30. | The wash water was then evaporated to yield solid sodium carbonate.
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