Abstract：The buffer solution is an important teaching content in inorganic chemistry and analytical chemistry. The calculation formula of buffer capacity of two buffer solutions composed of triptotic weak acids was deduced, and the additivity of buffer capacity was discovered. The buffer capacity of 0.10 mol/L citric acid-0.10 mol/L phosphoric acid and Clark-Lubs buffer solution (0.20 mol/L phthalic acid-0.20 mol/L phosphoric acid-0.20 mol/L boric acid) under different pH conditions was calculated by Excel. The changing curve of buffer capacity against pH was graphically displayed. The buffer range of buffer solutions above was intuitively shown. The results indicated that the citric acid-phosphoric acid buffer solution had good buffer effect at pH<8, while Clark-Lubs buffer solution exhibited good buffer effect at pH<10.
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