2- What is the bicarbonate alkalinity of the water sample in question 1 ? a) 45 mgl as Caco: b)150 ml as Caco C)120 mgl as Caco d) 100 mgl as Caco. 3- Calcium oxide can be produced by the thermal decomposition of calcium carbonate according to the equation: Caco. -- CaO + CO2. What is the amount of calcium carbonate needed to produce 112 g of calcium oxide? a) 1.129 b) 0.129 c)2.129 ) 29 4- calculate the concentration of hydroxide (OH in equilibrium with solid Calcium hydroxide Ca(OH). for which K-=7.9 10+? Ca(OH) -- Car +20H a) 1.25 * 10-2M b) 25 10-M c) 1510M d) 1.25