A water sample having a pH of 10 at 25°C contains the following ions: Na* = 56 mg/1 Mg²+ = 24 mg/1 Ca²+ = 50 mg/1 The carbonate and non-carbonate hardness of the water sample, respectively are A B C CO₂-² = 75 mg/1 Cl- = 35.5 mg/1 D 125 and 225 (mg/1 as CaCO3) 125 and 100 (mg/1 as CaCO3) 130 and 225 (mg/l as CaCO3) 130 and 95 (mg/1 as CaCO3)

A metal body floats at the interface of water and oil ( sp .gr.=0.85) such that 35% of its volume is submerged in water and 65% in oil. The density of metal would be ?

Calculate the alkalinity of a water containing 10−4.5 M total carbonate at pH 11. Express your answer in units of mg/L–CaCO3. State all relevant assumptions.

You have 1 mL (total volume) sample of quartz spheres, and it has a mass of 2.00g . What is the Void Ratio, using only the above information?   Void Ratio: e = Vv /Vs Vv= volume of voids Vs = volume of solids