1.A 72-cm3 sample of moist soil weighs 141.5 g. When it is dried out in an oven, it weighs 122.7 g. The specific gravity of solids is found to be 2.66. Find the water content, void ratio, porosity, degree of saturation, and wet and dry unit weights.
2.A soil specimen has a water content of 18% and a wet until weight of 118.5 lb/ft. The specific gravity of solids is found to be 2.72. Find the dry unit weight, void ratio, and degree of saturation.
3.The area of a parking lot is calculated to be 5,474 ft^2 with an estimated standard deviation of 2 ft^2. What is the maximum anticipated error? there is a 90% chance that the error range will be what?
4.What is the concentration (M) of Al3+ in lake water with pH = 4 assuming the equilibrium below with excess Al(OH)3 (s)? The reaction is Al(OH)3 (s) --> Al3+ + 3OH-. pKsp = 32.9.