experiment II chem lab III

experiment II chem lab III - Purpose To find the pKa of an...

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Purpose: To find the pKa of an unknown acid-base indicator using several experiments and measuring the absorbance. Procedure: For procedure A is referred to the lab manual for General & Analytical Chemistry III lab. Procedure B: 1- The absorbance of solutions C and D are measured at the intervals of 50nanometers(nm) and using the blank (distilled water) every time the wavelength is changed to zero the absorbance. 2- The absorbance readings are not higher than 1.00A therefore this procedure is continued. The high points from the absorbance readings are from 0.60 to 1.00. 3- The data collected is then used to make a plot of absorbance, A (y-axis) , versus the wavelength, nm (x-axis) 4- Based on the data the higher absorbing curve is solution C which we will then be working with the acid form of the indicator and HCl will be used for the rest of the experiment. Procedure C: 1- Solution C is used for this procedure. 8 solutions are made from the indicator with known concentrations.
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