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Fractional amount of the potassium dihydrogen phosphate

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Reference no: EM132732307

A solution is made by dissolving 0.1283 g of the acid form of the buffer TRIS (molecular mass = 157.60 g/mol) along with 0.1975 g of the basic form of TRIS (molecular mass = 121.136 g/mol). The pKa of TRIS is 8.08. A very small amount of potassium dihydrogen phosphate is added (not enough to cause any change in the pH). What is the fractional amount of the potassium dihydrogen phosphate that is in the PO43- form? Phosphoric acid is a triprotic acid with pKa1 = 2.16, pKa2 = 7.21 and pKa3 = 12.32.

Reference no: EM132732307

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