Find the pH of the following solutions:   0.03M trichloroacetic acid, Cl3CCO2H, pKa = 0.638

After dissolving HCI in water, the final concentration of H3O+ is 8.86x10-2. What is the pH of this solution? Give your answer to the 2nd decimal.

The pH of saliva is normally in the range of 6.4 to 7.0. However, when a person is ill, the person's saliva becomes more acidic. (a) When Marco is sick, he tests the pH of his saliva and finds that it is 5.7. What is the hydrogen ion concentration of his saliva? (Round your answer to seven decimal places.)  M(b) Will the hydrogen ion concentration in Marco's saliva increase or decrease as he gets better?

A new potential cure for the common cold, code-named Z-123, is being tested by a pharmaceutical company. As a research technician, you are told that Z-123 is a monoprotic weak acid, and the company is interested in the drug's Ka value.To find the pKa of Z-123, you prepare a 0.091 mol/L test solution of the drug. The pH of the solution is determined to be 2.77.What is the pKa of Z-123?Express your answer to two decimal places.pKa =   === What is pKb of the conjugate base of Z-123?Express your answer using two decimal places.pKb =