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The amphoteric properties of four sulfide minerals were characterized byacidimetric-alkalimetric titration. Chalcocite, galena, and sphalerite were found to bediprotic acids, while pyrite was determined to be a triprotic acid. Intrinsic acidity con-stants for the four minerals are as follows: chalcocite-pKa1=5.25, pKa2=9.68;galena- pKa1=5.26, pKa2=9.62; sphalente- pKa1= 5.08, pKa2= 9.13;and pyrite - pKa1 = 3.50,pKa2=5.32, pKa3=9.81.
