The Ka and Molar Mass of a Monoprotic Weak Acid Essay

1676 Words Jan 27th, 2013 7 Pages
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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