Question

9. What is the approximate ratio of lactic acid molecules to lactate ions in a urine sample at pH 4.9? (lactic acid pK = 3.9)                                                                                                                                                       a. 1 : 100       b. 1 : 10          c. 1 : 1             d. 10 : 1          e. 100 : 1

Explaination pls.

Answer 1

We have 4.9 - 3.9 = 1 For a weak acid % non-ionised = 10 So; Molecules ions = 10/100 = 1/10 Option b is correct