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Ka and Kb

#### Q. Arrange the following amines in order of decreasing base strength. Rank from the strongest to weakest base. To rank items as equivalent, overlap them. NH3, NH2Br, CH3NH2, (CH3)2NH

Solved • Feb 25, 2020

Ka and Kb

#### Q. A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. To find the pKa of X-281, you prepare a 0.076 M test solution of X-281 at 25.0 degrees C. The pH of the solution is determined to be 3.00. What is the pKa of X-281? Express your answer numerically. Conjugate pairs At 25 °C, for any conjugate acid-base pair pKa + pKb = 14.00 What is the pKb of the conjugate base of X-281? (Assume 25 °C.) Express your answer numerically.

Solved • Feb 25, 2020

Ka and Kb

#### Q. If Kb for NX3 is 2.0x10^-6, what is the pKa for the following reaction? HNX3^+(aq) + H2O(l) ⇌ NX3(aq) + H3O^+(aq) Express your answer numerically to two decimal places.

Solved • Feb 25, 2020

Ka and Kb

#### Q. At a certain temperature, the pH of a neutral solution is 7.66. What is the value of Kw at that temperature? Express your answer numerically using two significant figures.

Solved • Feb 25, 2020

Ka and Kb

#### Q. If Kb for NX3 is 3.5x10^-6, what is the pKa for the following reaction? HNX3^+(aq) + H2O(l) ⇌ NX3(aq) + H3O^+(aq) Express your answer numerically to two decimal places.

Solved • Feb 17, 2020

Ka and Kb

#### Q. Fill in the left side of this equilibrium constant equation for the reaction of trimethylamine ((CH3)3N), a weak base, with water.

Solved • Mar 4, 2020

Ka and Kb

#### Q. Fill in the left side of this equilibrium constant equation for the reaction of hypobromous acid (HBrO) with water.

Solved • Mar 4, 2020