Chemistry Homework Help

Browse Homework Solutions

139 solutions

Weak Bases

Q. A 0.080 M solution of a weak base has a pH of 10.75. What is the percent ionization of this weak base?

Solved • Apr 26, 2020

Weak Bases

Q. Hydrocyanic acid (HCN) is a weak acid with Ka = 4.9 x 10Æ10. What is the pH of a 0.040 mol/L potassium cyanide (KCN) solution?

Solved • Apr 14, 2020

Weak Bases

Q. Veronal, HC8H11N2O3, is a barbiturate drug, that is used in medicine as a long duration hypnotic and sedative. The Ka of this substance is 3.7 x 10-8. It is generally administered as the sodium salt (C8H11 N2NaO3). What is the pH of a solution of C8H11 N2NaO3 that contains 35 mg of the drug in 500 ml of solution?

Solved • Apr 14, 2020

Weak Bases

Q. Ethylamine (C2H5NH2) is a flammable liquid with an ammonia-like odor that is miscible with water. It is irritating to skin, mucous membranes and to the respiratory tract. If the pKa of ethylamine is 10.70, and its density is 0.689 g/ml at 15oC, explain how you would prepare 500 ml of this solution to yield a final solution with a pH of 12.0 at 15oC.

Solved • Apr 14, 2020

Weak Bases

Q. Veronal, HC8H11N2O3, is a barbiturate drug, that is used in medicine as a long duration hypnotic and sedative. The Ka of this substance is 3.7 x 10-8. It is generally administered as the sodium salt (C8H11 N2NaO3). What is the pH of a solution of C8H11 N2NaO3 that contains 35 mg of the drug in 500 ml of solution?

Solved • Apr 13, 2020

Weak Bases

Q. Lactic acid, HC3H5O3, is a substance found in sour milk products such as yogurt and is produced naturally by fermentation in body cells during normal metabolism and exercise The Ka for lactic acid is 1.38 x 10-4. Its sodium salt, sodium lactate, NaC3H5O3 , is used in foods as a preservative and acidity regulator . It is also used in shampoo products as an effective humectant and moisturizer. Determine the pH of a solution prepared by diluting 6.10 grams of sodium lactate to a final volume of 750

Solved • Apr 13, 2020

Weak Bases

Q. Ethylamine (C2H5NH2) is a flammable liquid with an ammonia-like odor that is miscible with water. It is irritating to skin, mucous membranes and to the respiratory tract. If the pKa of ethylamine is 10.70, and its density is 0.689 g/ml at 15oC, explain how you would prepare 500 ml of this solution to yield a final solution with a pH of 12.0 at 15oC.

Solved • Apr 13, 2020