An organic base (b) has a pka of 6.950 and a partition coefficient, between water and ether, of 3.0. the organic base is extracted from 225 ml of a 0.175 m aqueous solution of b, that has been adjusted to a ph of 8.00, with 75.5 ml of ether. only one extraction is performed. calculate the concentration of the organic base (b) in the water phase after the extraction.

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.