1- Calculate the pH of 0.1 M KHCO3.
2- Calculate the pH of the following buffer solutions:
a) 0.0405 M NH4OH + 0.02 M (NH4)2SO4 .
b) 0.0176 M phenol + 0.0254 M sodium phenolate.
c) 1 M Cl3CCOOH + 0.5 M Cl3CCOONa .
d) 0.164 M ethylamine + 0.272 M ethylamine hydrochloride.
3- Calculate the ratio of salt/acid or salt/base for the following buffer solutions which give
pH = 9.8 :
a) NH3, NH4Cl.
b) CH3NH2, CH3NH3Cl.
c) HCN, NaCN.
d) HOCl, NaOCl.
4- A liter of solution contains 0.25 M HCOOH and 0.3 M HCOONa, calculate the pH of
this solution. Calculate the change of pH of this solution when 10 mL of 0.1 M HCl and
10 mL of 0.1 M NaOH are added separately to this solution.
Ka HCOOH=1.75 x 10-4
5- A mixture of 0.123 M NH4Cl and 0.246 M NH4OH has a volume of 20 mL, calculate its
pH value. 1 mL of 1 M HCl and 1mL of 1 M NaOH are added separately to this solution. Calculate the change in pH value.
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