Creative Education

Volume 1, Issue 2 (September 2010)

ISSN Print: 2151-4755   ISSN Online: 2151-4771

Google-based Impact Factor: 2.04  Citations  

Determination of the pKa Value of Phenolphthalein by Means of Absorbance Measurements

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DOI: 10.4236/ce.2010.12020    21,397 Downloads   38,258 Views  Citations

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ABSTRACT

We here report a laboratory protocol for the determination of the pKa value of an acid by means of determinations obtained with a spectrophotometer. Students determine the acidity constant (Ka) and the pKa associated with phenolphthalein from the absorbance values obtained from phenolphthalein solutions at different pHs. The present protocol for the determination of the pKa takes a very short time and is useful when teaching in conditions with limited equipment.

Share and Cite:

Alonso, M. , Chapela, S. , Cristaldo, M. , Nievas, I. , Gamondi, H. and Stella, C. (2010) Determination of the pKa Value of Phenolphthalein by Means of Absorbance Measurements. Creative Education, 1, 130-133. doi: 10.4236/ce.2010.12020.

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