3. Methyl orange behaves much like methyl red in the respect that it is mostly protonated at very low pH values and mostly deprotonated at high verypH values. If a solution of methyl orange at a pH of 3.53 had a (Hln] concentration of 0.0420 M and a [In] concentration of 0.0230 M. Would wouldthe k, of methyl orange be at this pH? Hint: see equation 2 in the lab manualO 1.6 x 104O 0.548O 5.8 x 10-5O 1.8 x 103 2. You add 10.00 ml of a 0.630 M methyl red solution to a 100.00 ml volumetric flask. You then add small volumes of sodium acetate and acetic acidsolutions to adjust the pH, and then fill the 100 mL volumetric flask to the mark with deionized water. You then make a spectroscopic measurementand obtain absorbance values of 0.253 at 520 nm and 0.079 at 420 nm. What is the concentration of [HIn] in the solution. Remember to use M;V1 =M2V2 as the first step in the calculation process. Hint: see eq. 6 in the lab manualA$20, = 0.367A520, = 0.010A420, - 0.012A420, = 0.275O 4.30 x 102O 0.430O 4.18 x 102O 0.418

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3. Methyl orange behaves much like methyl red in the respect that it is mostly protonated at very low pH values and mostly deprotonated at high very pH values. If a solution of methyl orange at a pH of 3.53 had a [HIn] concentration of 0.0420 M and a [In'] concentration of 0.0230 M. Would would the k, of methyl orange be at this pH? Hint: see equation 2 in the lab manual O 16 x 10 O 0.548 O 5.8 x 105 O 18 x 10

3. Methyl orange behaves much like methyl red in the respect that it is mostly protonated at very low pH values and mostly deprotonated at high very pH values. If a solution of methyl orange at a pH of 3.53 had a [HIn] concentration of 0.0420 M and a [In'] concentration of 0.0230 M. Would would the k, of methyl orange be at this pH? Hint: see equation 2 in the lab manual O 16 x 10 O 0.548 O 5.8 x 105 O 18 x 10

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions

Section4.8: Stoichiometry Of Reactions In Aqueous Solution-titrations

Problem 2RC

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