- 3 Three Water Samples At Ph 7 5 Have The Same Alkalinity Equal To 130 Mg L Caco3 And A Content Of Ca2 And Mg2 I 1 (111.07 KiB) Viewed 76 times
= 3) Three water samples (at pH 7.5) have the same alkalinity, equal to 130 mg/l CaCO3, and a content of Ca2+ and Mg2+ ions equal respectively to: i. Ca2+ = 70 mg/l; Mg2+ = 12 mg/l ii. Ca2+ = 52 mg/l; Mg2+ = 18 mg/l iii. Ca2+ = 46 mg/l; Mg2+ = 24 mg/l Calculate total, carbonate, and non-carbonate hardness, Calcium carbonate hardness, magnesium carbonate hardness, calcium non-carbonate hardness, and magnesium non- carbonate hardness (all expressed in °F). 4) A water sample at 25°C presents pH=7 [H2CO3*]=0.5 meq/L K1* =4.47x10-7 Determine: a. the concentration of hydrogen carbonate b. the acidity (expressed in M, in N, and in mg/L CaCO3) c. the alkalinity (expressed in M, in N, and in mg/L CaCO3) d. the total inorganic carbon content (Cr) (expressed in M) 5) A water sample at 25°C presents Ap = 0 Am = 100 mg/l CaCO3 Acidity = 2.30 meq/ Cat2 = 70 mg/ Mg+2 = 12 mg/ K1* = 4.47x10-7 Calculate the pH and all the types of hardness (total, carbonate, and non-carbonate of calcium and magnesium) expressed in °F and mg/L CaCO3