Caffeine (C8H10N4O2) is a weak base. The pH of a caffeine concentration of 455 mg/L is found to be 7.48. Calculate the pKb of the solution.
Caffeine (C8H10N4O2) is a weak base. The pH of a caffeine concentration of 455 mg/L is...
Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing a caffeine concentration of 460 mg/L . Express your answer to one decimal place.
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.
Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Part A Calculate the pH of a solution containing a caffeine concentration of 281 mgL−1 . Express your answer to one decimal place.
1) The pH of an aqueous solution of 0.442 M caffeine (a weak base with the formula C8H10N4O2) is ______ 2) The hydroxide ion concentration, [OH-], of an aqueous solution of 0.442 M diethylamine (a weak base with the formula (C2H5)2NH) , Kb = 6.9×10-4, is: [OH-] = ________ M.
The pH of an aqueous solution of 0.462 M caffeine (a weak base with the formula C8H10N4O2) is
Caffeine, C8H10N4O2is a weak base. Determine the value of Kbfor caffeine if a solution at equilibrium has [C8H10N4O2] = 0.050M, [C8H10N4O2H+] = 5 x 10-3 M, and [OH-] = 2.5 x 10-3M C8H10N4O2(aq) + H2O(l) ⇌ C8H10N4O2H+(aq) + OH-(aq)
Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 230 mg/L . Express your answer to two decimal places.
Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 240 mg/L . Express your answer to one decimal place.
Caffeine is a weak base with a Kb of 4.1×10−4. Calculate the initial molar concentration of a solution of caffeine if the pH is 10.42.
Part A) Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 205 mg/L. Express your answer to two decimal places. Part B) Find the pH of a 0.150 M solution of a weak monoprotic acid having Ka= 0.20. Express your answer to two decimal places. B2) Find the percent dissociation of this solution. Express your answer using two significant figures.