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Citation: YOU Qing, ZHAO Fu-Lin, WANG Ye-Fei, DAI Cai-Li, MU Li-Na, HE Long. Determination of Solubility Product of Calcium and Magnesium Silicate[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1464-1466. shu

Determination of Solubility Product of Calcium and Magnesium Silicate

1.
College of Petroleum Engineering, China University of Petroleum(East China), Dongying 257061

Corresponding author: YOU Qing,
Received Date: 20 December 2006
Available Online: 5 May 2007

The equilibrium concentration of Ca²⁺ and Mg²⁺ in a calcium and magnesium silicate(CaO·mSiO₂,MgO·mSiO₂,m is the modulus) saturated solution was determined with an ICPS-1000IV high frequency plasma emission spectrograph at a certain temperature.The solubility product of calcium and magnesium silicate was calculated,and the effects of temperature and water glass modulus on the solubility product were also studied in this article.The results indicate that the solubility product of calcium silicate is smaller than that of the magnesium silicate.When the temperature is 30℃ and the water glass modulus is 3.29,the solubility product of calcium silicate is 1.14×10^-8,while the solubility product of magnesium silicate is 2.29×10^-5.At the same temperature,the solubility product of the corresponding calcium and magnesium silicate decreases with the increase in the water class modulus.Since the increase in the modulus causes the silicate ionic diameter to become bigger,the calcium and magnesium silicate crystal is easier to precipitate,which makes the solubility product of both calcium and magnesium silicate decrease.
- calcium and magnesium silicate,
- solubility product,
- water glass
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