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The ammonium ion (NH4+, pKa = 9.25) has a lower pKa than the methylammonium ion (CH3NH3+, pKa = 10.66). Which is the stronger base, ammonia (NH3), or methylamine (CH3NH2)? Explain.

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Bryllant Baluyut
Bryllant BaluyutLv10
9 Nov 2020

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Related questions

The benzyl ammonium ion (C6H5CH2NH3+) has pKa = 9.33, and the propylammonium ion has pKa=10.71. Which is the stronger base, benzylamine, or propylamine? What is the pKb of benzylamine and propylamine?

Ammonia (NH3) is a weak base with a pKb of 4.75. Its conjugate acid, ammonium (NH4+) has a pKa of 9.25. Set up a titration using 20.00 mL of HCL to titrate 20.00 mL of aqueous ammonia solution.
 
Concentration of HCl soln: 0.1044 mol/L
Initial buret reading (mL): 0.00
Buret reading at equivalence pt (mL): 14.41
 
Calculate the following:
 
a.) Moles of HCl added at equivalence pt
 
b.) Moles of NH3 in sample
 
c.) NH3 concentration (mol/L)
 
d.) pH at the equivalence point
 
e.) pH at half the volume required to reach equivalence
 
f.) pKa of ammonium (NH4+)
 
g.) pKb of ammonia

Ammonia (NH3) is a weak base with a pKb of 4.75. Its conjugate acid, ammonium (NH4+) has a pKa of 9.25. Set up a titration using 20.00 mL of HCL to titrate 20.00 mL of aqueous ammonia solution.

Concentration of HCl soln: 0.1044 mol/L

Initial buret reading (mL): 0.00

Buret reading at equivalence pt (mL): 14.41

Calculate the following:

a.) Moles of HCl added at equivalence pt

b.) Moles of NH3 in sample

c.) NH3 concentration (mol/L)

d.) pH at equivalence point

e.) pH at half the volume required to reach equivalence point

f.) pKa of ammonium (NH4+)

g.) pKb of ammonia

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