Codeine (C18H21NO3) is a derivative of morphine and is used as an analgesic, narcotic, or antitussive.

Codeine (C18H21NO3) is a derivative of morphine and is used as an analgesic, narcotic, or antitussive. It was once commonly used in cough syrups but is no longer available over the counter because of its addictive properties. Its Kb = 8.9 x 10-7. Calculate the pH of 0.017 M solution of codeine to two decimal places.Vitamin C is the common name for ascorbic acid, HC6H7O6 whose Ka = 8.0 x 10-5. Calculate (to two decimal places) the pH of a 0.043 M solution of this weak acid.