The Ka and Molar Mass of a Monoprotic Weak Acid Essay

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The Ka and Molar Mass of a Monoprotic Weak Acid Chemistry Lab 152 Professor: James Giles November 7, 2012 Abstract: The purpose of this experiment was to determine the pKa, Ka, and molar mass of an unknown acid (#14). The pKa was found to be 3.88, the Ka was found to be 1.318 x 10 -4, and the molar mass was found to be 171.9 g/mol. Introduction Acids differ considerable as to their strength. The difference between weak and strong acids can be as much as 10 orders of magnitude. Strong acids dissociate more completely than weak acids, meaning they produce higher concentrations of the conjugate base anion (A-) and the hydronium cation (H30+) in solution. HA(aq)…show more content…
|25.4 |9.74 | |2 |2.94 |19.4 |4.58 |22.2 |6.72 |25.9 |9.82 | |4 |3.18 |19.6 |4.61 |22.25 |6.87 |26.4 |9.96 | |5 |3.3 |19.8 |4.65 |22.3 |6.98 |26.9 |10.02 | |6 |3.4 |20 |4.68 |22.35 |7.06 |27.4 |10.11 | |7 |3.49 |20.2 |4.72 |22.4 |7.14 |28.4 |10.21 | |8 |3.58 |20.4 |4.77 |22.5 |7.24 |29.4 |10.31 | |9 |3.66 |20.6 |4.84 |22.6 |7.44 |31.4 |10.46 | |10 |3.73 |20.8 |4.88 |22.7 |7.58 |33.4 |10.58 | |11 |3.88 |21 |4.94 |22.8 |7.73 |35.4 |10.67 | |12 |3.91 |21.2 |5.02 |22.9 |7.89 |36.4 |10.75 | |13 |3.97 |21.4 |5.11 |23 |8.03 |39.4 |10.87 | |14 |4.04 |21.6 |5.25 |23.1 |8.17 |42.4 |10.96 | |15 |4.11 |21.7 |5.32 |23.2
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