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28 Nov 2020
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 the equivalence point
e.) pH at half the volume required to reach equivalence
f.) pKa of ammonium (NH4+)
g.) pKb of ammonia
Coleen AmadoLv10
15 Jan 2021