What is the difference between anhydrates and dihydrates? Can I use anhydrates instead of dihydrates and viceversa?
Yes, you can. You must calculate the percentage of calcium chloride in Mw of calcium chloride dihidrate and use this "correlation coefficient".
Yes you can use hydrated form of salts but just consider H2O in your calculations.
Yes, you can. The difference between anhydrate and dihydrate is that anhydrate form CaCl2 does not contain any water molecule whereas dihydrate form contains two H2O molecules per CaCl2 molecule. Therefore, the molecular weight of dihydrate form is 36 g/mol heavier than the molecular weight of anhydrate form due to the two more H2O molecules.
The amount of water that is part of the compond. Annhydrous is defined as: Without water, especially water of crystallization.
There fore the Annhydrous calcium Chloride simply has a higher over all amount of calcium by weight. CaCl2 which has a molecular weight of 110.98 g/mol. Allegedly this would mean it is 100% calcium chloride.
Verus calcium chloride dihydrate : CaCl2·2H2O has a molecular weight of 147.0 g/mol
This means the dihydrite is theoretically at most: (110.98 g/mol/147 g/mol x 100%) = 75.50 % calcium chloride.
In the real world the calcium chloride dihydrate is said to vary from 77% to 80% calcium chloride.
As for a physical difference. Not any real visual indicators except the more common calcium chloride is probably the Kent's Turbo Calcium or Peladow Calcium Chloride. Where as the calcium chloride dihydrate is typically in a flake form and most commonly sold labeled as DOWFLAKEâ„¢ Xtra Calcium Chloride. The Peladow Calcium Chloride is sold in a pellet form. Dow also sells Annhydrous calcium Chloride formed into mini pellets as a concrete accelerant.
Both also contain trace amounts of Bromide and both contain small amounts of Potasium Chloride (2 to 3%) and Sodium Chloride (1 to 2%).
@ Asif Rather If we apply it in food emulsions/gels, does it affects differently??
Is there any difference if I use CaCl2 * 6H2O instead of CaCl2 * 2H2O for culturing medium?
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