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To raise calcium by 20 ppm in 100 L: 5.5 g.
Same use as the dihydrate but about a third stronger by weight. Absorbs water from air, so weigh it quickly and keep it sealed.
• Dissolving releases a lot of heat; add to water slowly.
• Hygroscopic: an opened bag gains weight and loses strength per gram.
Molar mass 110.98 g/mol.
stoichiometry (IUPAC atomic weights)