ENDLAB9 - Conclusion/Discussion The purpose of this lab was...

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Conclusion/Discussion The purpose of this lab was to study the properties of Bronsted-Lowry acids and bases, pH scale and equilibria associated with common household acids and bases. Acids and bases are often described as being “weak” or “strong”. While this classification seems somewhat arbitrary, other more quantitative descriptors exist. For acids, Ka values are commonly used. The Ka value is an indication of acid strength. The larger the value of the Ka, the stronger the acid. This value is characteristic of the acid and can be used to help identify an unknown acid. The Ka values we determined for phenolphthalein, methyl orange, bromethymol blue, and the universal indicator were for the most part close to the literature values of Ka. Reasons for our numbers being slightly larger could simply be human error, mixing wrong etc. For example, our determined Ka value for phenolphthalein was 1.5*10 -8 while the literature value was 1*10 -10 . Our pH could be slightly off because we added one drop too many or one drop too little. Another method we used to determine pH of solutions was the universal indicator, which is a mixture of four weak acid indicators. This solution is most likely made up of
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This note was uploaded on 04/20/2008 for the course CHEM 1310 taught by Professor Cox during the Fall '08 term at Georgia Tech.

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ENDLAB9 - Conclusion/Discussion The purpose of this lab was...

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