Kalsiyum hidrat ve kalsiyum hidroksit aynı maddeyi ifade eder. Kalsiyum hidroksit (Ca(OH)₂), sönmemiş kirecin (kalsiyum oksit) su ile karıştırılması sonucu elde edilir.
CaCO3, CaO ve CO2'ye ayrışır çünkü bu, termal ayrışma veya kalsinasyon olarak adlandırılan bir ısıtma sürecidir. Bu reaksiyon, 178 kJ/mol enerjisiyle 840 °C'nin üzerine çıktığında gerçekleşir.
Kalsiyum karbonat (CaCO3) suyla doğrudan reaksiyona girmez çünkü suda çok az çözünür. Bunun nedeni, kalsiyum karbonatın kristal kafes yapısındaki güçlü iyonik bağların ve ortak iyonik etkinin, sudaki çözünürlüğünü kısıtlamasıdır.
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