Mid-term review problems

1. To model the rate of porosity development in a sandstone, you use the concept of a long tube to mimic a series of pores. In your system 0.01 ml per minute of distilled water is flowing through a 1 km long quartz tube with a circular cross-section of 0.5 mm internal diameter (ID). Assume infinite dilution, and do not try to account for the change in the properties of water. The rate of dissolution of quartz in water is 10-15.5 mols/cm²/sec. Ksp55 of quartz is 10^-3.5 moles l^-1.

2. What is the pH and the concentration of all three carbonate species in a water at equilibrium with an open system of Pco2 = 10^-0.3

3. Construct a Bjerrum plot using the supplies provided. Put pH vs. log concentration axes along with [OH] and [H] lines on the graph paper provided, tape the transparency to the graph paper and plot concentration vs. pH on the transperency.  To plot your points along the graph you can use any acid with a known pKa and the ionization fraction equations.