Find the [acid] / [conjugate base] ratio that will yield the specified pH:

a. [HC2H3O2] / [C2H302-] for pH 4.50

b. [HNO2] / [NO2-] for pH 3.41

c. [NH4+] / [NH3] for pH 9.50

Question

Find the [acid] / [conjugate base] ratio that will yield the specified pH:

a. [HC2H3O2] / [C2H302-] for pH 4.50

b. [HNO2] / [NO2-] for pH 3.41

c. [NH4+] / [NH3] for pH 9.50

anonymous · Answer

Another is 0.16 of HZ is 1.2% dissociated. Calculate the pH of the solution and Ka.

aaronq · Answer

use the henderson hassle back equation

$$pH = pKa + \log \frac{ [A-]}{[HA] }$$

aaronq · Answer

or i guess since they're asking for the ratio of acid/conjugate base, invert the last part:

$$pH=pKa-\log \frac{ [HA] }{ [A ^{-}] }$$