A buffer is made by preparing a 1.00 L solution that contains 0.15 mol in formic acid (HCOOH) and 0.20 mol in sodium formate (HCOONa). The Ka of formic acid is 1.8x10-4 . (a) Determine the pH of the buffer (b) What is the pH of the buffer after the addition of 0.05 mol of NaOH

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).