3. The following %T data were obtained for a phenol red solution at 560 nm. when two drops of con...
3. The following %T data were obtained for a phenol red solution at 560 nm. when two drops of concentrated HCI were added to the pH 7.13 solution, the indicator was converted to pure Hin form. Its measured absorbance, AHI , was 0.0003. When two drops of 50% NaOH were added to the pH 8.56 solution, the result was pure In' form. The measured absorbance of this solution, Aln-, was 0.712. Calculate the A and pKa value for eaclh solution by completing the table below. Determine the average pK.. Calculate Ka from the average pk. (A-An) (AHin-A) pK log7A pH 7.13 7.39 96T 71.8 58.4 7.79 39.6 8.21 28.2 8.56 23.6
3. The following %T data were obtained for a phenol red solution at 560 nm. when two drops of concentrated HCI were added to the pH 7.13 solution, the indicator was converted to pure Hin form. Its measured absorbance, AHI , was 0.0003. When two drops of 50% NaOH were added to the pH 8.56 solution, the result was pure In' form. The measured absorbance of this solution, Aln-, was 0.712. Calculate the A and pKa value for eaclh solution by completing the table below. Determine the average pK.. Calculate Ka from the average pk. (A-An) (AHin-A) pK log7A pH 7.13 7.39 96T 71.8 58.4 7.79 39.6 8.21 28.2 8.56 23.6