1.Calculate the maximum pressure developed when a 10 in. thick wall 10 ft high is to be poured at the rate of 3ft/hr at a temperature of 70 degrees F.
2.A sulfuric acid solution is added to scale-forming water to convert calcium carbonate to calcium bicarbonate. Writer the chemical equation for the reaction, and calculate the amount of sulfuric acid in milligrams per liter to neutralize 20 mg/l of calciums carbonate.
if water sample contains 40 mg/l of ca++ and 10 mg/l of mg++, what is the hardness expressed in milligrams per liter as CaCO3 .