Calculate the pH of a 1.41×10-2 M solution of the decongestant ephedrine hydrochloride if the pKb of ephedrine (its conjugate base) is 3.86.
1.The pH of a 2.65×10-3 M solution of a weak base is 9.17. Calculate pKb for this base to two decimal places. 2.Determine the mass (in g) of sodium butanoate (NaC3H7COO) that must be added to 78.9 mL of 0.609 M butanoic acid to yield a pH of 6.43. Report your answer to 3 significant figures. Assume the volume of the solution does not change and that the 5% approximation is valid.
Calculate the pKb for a substance given that a 0.100M solution has a pH of 10.65.
What is the pH of a 0.231 M solution of hydrazine, N2H4? The pKb of hydrazine is 6.02.
What is the pKb of a weak base KA if the pH of a 0.079-M solution of KA is 9.40?
Calculate the pH of a 1.01×10-2M solution of the decongestant ephedrine hydrochloride if the pKb of ephedrine (its conjugate base) is 3.86.
What is the pH of a 75.0L solution that is 0.047M in weak base and 0.057 M in the conjugate weak acid (?a=7.2×10−8)
9. Calculating pH of a salt solution a) Calculate the pH of a 0.98M solution of NH4Br. pKb-4.75 b) Calculate the pH of a 0.24M solution of C6H5NH3CI. pkb- 4.87
2-aminoethanol is a weak base with a pkb=4.50. What is the pH of a 0.150 M 2-aminoethanol solution?
Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing a caffeine concentration of 156 mgL−1 . Express your answer to one decimal place.