A certain buffer solution contains equal conc. of X and HX. Ka for HX is 10-8. The pH of buffer is:
Correct answer: B. 8
- A. 3
- B. 8
- C. 11
- D. 14
Explanation
pKa=-log KapKa=-log10-8pKa = 8log10=8(1)=8pH = pKa + log [Salt /Acid]pH = 8+log I/IPH=8+0=8If concentration of salt and acid is equal, then buffer solution has pH = pKa. Such buffer is called best buffer.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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