# Calculate the mass fraction of calcium in chloride, nitrate and phosphate. Arrange these salts in ascending order of metal mass fraction

Calculate the mass fraction of calcium in chloride, nitrate and phosphate. Arrange these salts in ascending order of metal mass fraction. Describe the solubility of these salts in water. Mass fraction of calcium in CaCl2:
Mr (CaCl2) = Ar (Ca) + 2 • Ar (Cl) = 40 + 2 • 35.5 = 111
ω (Ca) = (Ar (Ca) / Mr (CaCl2)) • 100% = (40: 111) • 100% = 36.04%
Mass fraction of calcium in Ca (NO3) 2:
Mr (Ca (NO3) 2) = Ar (Ca) + 2 • Ar (N) + 6 • Ar (O) = 40 + 2 • 14 + 6 • 16 = 164
ω (Ca) = (Ar (Ca) / Mr (Ca (NO3) 2)) • 100% = (40: 164) • 100% = 24.39%
Mass fraction of calcium in Ca3 (PO4) 2:
Mr (Ca3 (PO4) 2) = 3 • Ar (Ca) + 2 • Ar (P) + 8 • Ar (O) = 3 • 40 + 2 • 31 + 8 • 16 = 310
ω (Ca) = (3 • Ar (Ca) / Mr (Ca3 (PO4) 3)) • 100% = (3 • 40: 310) • 100% = 38.71%
Answer: Calcium Nitrate, Calcium Chloride, Calcium Phosphate.
Describe the solubility of these salts in water.
CaCl2 calcium chloride – soluble
Ca (NO3) 2 calcium nitrate – soluble
Ca3 (PO4) 2 calcium phosphate – insoluble Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.