a) 1 4- calculate the cond hydroxide Ca(OH). for which Ko= a) 1.25 x 10-2M b) 2.3 * 10--M c) 1.5x 10-M 5. How many grams of calcium will be required to combine with 180 g of carbonate to form calcium carbonate? a) 60 g b) 120 g c)170 g d) 180 g 6- What is the equivalent calcium carbonate concentration of 180 mg/L of (MgSO.) ? a) 60 mg L as Cacos b) 180 mg L as Cacos C) 120 mg/l as CaCO3 d) 150 mg/l as CaCO3 .7- What is the equivalent calcium carbonate concentration of 4 x 10-3 mol/L of NaCl ? a) 100 mg/L as Cacos b) 250 mg/L as Caco, c) 200 mg/L as Cacos d) 150 mg/L as CaCO3 8-A 100 ml sample of water is tested for alkalinity. The normality of the sulfuric acid used for titrating is 0.02 N. If 1.6 ml is used to pH 8.3, and 2.4 ml titrant is used to pH 4.5. what is the total alkalinity of the sample? a) 16 mg/L as Caco, b) 40 mg/l as Cacos c) 24 mg/L as Caco, d) 12 mg/L as Caco, 9- 200 ml sample of water was collected, 5 ml of sample water diluted to 300ml with organic- free, oxygen-saturated water the dissolved oxygen content was 7.3 mg/L initially, after 5 days, the dissolved oxygen content had dropped to 4.8 mg/L. What is the BODs? a) 120 mg/l c) 0.5 mg/L b) 150 mg/l d) 200 mg/L 10- Calculate the solubility product value of Cus which has a solubility of 3.56x10-23 M at 250? Cus-Cu2+ + S2 d) 3.6 x 10-2 C) 1.8 x 10-25 b) 1.6 10-36 a) 1.27 x 10-45