You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-1-sulfonic acid) and 10.0...

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Chemistry

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS(3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.079 M NaOH.Next, you add 1.00 mL of 5.67 Ã— 10^-5 M lidocaine to this mixture.Denoting lidocaine as L, calculate the fraction of lidocainepresent in the form LH+.
MOPS Ka = 6.3 Ã— 10^â€“8.
Lidocaine Kb = 8.7 Ã— 10^â€“7
(Hint: First calculate the pH of the solution from the amount ofMOPS added. Start by finding the number of moles (or millimoles) ofHA and OHâ€“. Which reactant is limiting? Next, find the amount of Aâ€“that forms and the amount of HA left over. Finally, determine the[Aâ€“]/[HA] ratio and use the Henderson-Haselbalch equation to findpH. The concentration of lidocaine is too low to affect this pHvalue. Calculate the pKa of lidocaine and then the fraction in theprotonated form from the pH and the pKa using the HendersonHasselbalch equation.)

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4.2 Ratings (851 Votes)

We have Ka of MOPS 63 108 Kb of Lidocaine 87 107 First we need to calculate pH of the solution 10 mL 01 MOPS acid 10 mm 10 mL 0079 079 mm NaOH See Answer

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