a) If you have 90.0 mL of a 0.200 M solution of ammonia, NH3, how many moles of NH4Cl would you need to add to obtain a buffer with a pH of 9.20. Assume that the addition of the NH4Cl does not change the volume of the solution. Note that the pK, of NH3 is 4.74. NH₂Cl : mol b) What mass of NH4Cl in grams, would need to be added to the original solution to obtain the desired pH? Again, assume that the addition of the NH4Cl does not change the volume of the solution. Mass: g 09

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
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Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 26QAP: You want to make a buffer with a pH of 10.00 from NH4+/NH3. (a) What must the [ NH4+ ]/[ NH3 ]ratio...
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a) If you have 90.0 mL of a 0.200 M solution of ammonia, NH3, how many moles of
NH4Cl would you need to add to obtain a buffer with a pH of 9.20. Assume that the
addition of the NH4Cl does not change the volume of the solution. Note that the pK, of
NH3 is 4.74.
NH₂Cl :
mol
b) What mass of NH4Cl in grams, would need to be added to the original solution to obtain.
the desired pH? Again, assume that the addition of the NH4Cl does not change the
volume of the solution.
Mass:
09
g
Transcribed Image Text:a) If you have 90.0 mL of a 0.200 M solution of ammonia, NH3, how many moles of NH4Cl would you need to add to obtain a buffer with a pH of 9.20. Assume that the addition of the NH4Cl does not change the volume of the solution. Note that the pK, of NH3 is 4.74. NH₂Cl : mol b) What mass of NH4Cl in grams, would need to be added to the original solution to obtain. the desired pH? Again, assume that the addition of the NH4Cl does not change the volume of the solution. Mass: 09 g
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