An experiment in a general chemistry laboratory calls for a 2.00-M solution of HCl. How many mL of 11.9 M HCl would be required to make 250 mL of 2.00 M HCl?

15.) a.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of nitrous acid to be 1.872.

Use the information she obtained to determine the K_a for this acid.

K_a(experiment) =

b.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of nitrous acid to be 1.870.

Use the information she obtained to determine the K_a for this acid.

K_a(experiment) =

c.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of hydrocyanic acid to be 4.928.

Use the information she obtained to determine the K_a for this acid.

K_a(experiment) =

1. In the laboratory, a general chemistry student measured the pH of a 0.540 M aqueous solution of triethylamine, (C₂H₅)₃N to be 12.239.

Use the information she obtained to determine the K_b for this base.

K_b(experiment) =

2. In the laboratory, a general chemistry student measured the pH of a 0.540 M aqueous solution of aniline, C₆H₅NH₂ to be 9.315.

Use the information she obtained to determine the K_b for this base.

K_b(experiment) =

3. In the laboratory, a general chemistry student measured the pH of a 0.540 M aqueous solution of triethylamine, (C₂H₅)₃N to be 12.209.

Use the information she obtained to determine the K_b for this base.

K_b(experiment) =