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93 solutions

Weak Bases

Q. The pain reliever codeine is a weak base with a Kb equal to 1.6x10^-6. What is the pH of a 0.05 M aqueous codeine solution? (A) 7.1 (B) 10.5 (C) 11.1 (D) 12.7

Solved • Dec 13, 2019

Weak Bases

Q. A 0.375 M solution of piperidine (C5H10NH, a weak base) is 5.73% dissociated. Determine the value of Kb for piperidine.

Solved • Dec 7, 2019

Weak Bases

Q. Suppose that ammonia, applied to a field as fertilizer, is washed into a farm pond containing 5.0x10^6L of water. If the ph of this pond is found to be 8.35, What volume of liquid ammonia found its way into the pond? Kb(NH3)=1.8x10^-5 | The density of liquid ammonia is 0.771g/cm^3

Solved • Nov 19, 2019

Weak Bases

Q. Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine pKb1 = 5.1 and pKb2 = 9.7 (pKb = −log(Kb)). Only 1.0 g of quinine will dissolve in 1900.0 mL of water. Calculate the pH of saturated aqueous solution of quinine. Consider only the reaction Q + H2O equilibrium reaction arrow QH + + OH − described by pKb1, where Q = quinine.

Solved • Nov 17, 2019

Weak Bases

Q. 5) calculate [OH-], pH and pOH of a 0.175M KHCO3 solution at 25°C

Solved • Nov 12, 2019

Weak Bases

Q. Determine the pH of a 0.22 M NaF solution at 25 degrees C. The Ka of HF is 3.5x10^-5. a) 10.20 b) 2.56 c) 11.44 d) 5.10 e) 8.90

Solved • Nov 8, 2019

Weak Bases

Q. Morphine is a weak base. A 0.150 M solution of morphine has a pH of 10.5. What is Kb for morphine? Express your answer using one significant figures.

Solved • Nov 8, 2019