Consider the reaction: H2SO3 + HCO3- ----> H2CO3 + HSO3- If HCL is added to the...
Consider the reaction: H2SO3 + HCO3- ----> H2CO3 + HSO3-
If HCL is added to the buffer you proposed (H2SO3,HSO3-), show with a chemical equation how this buffer maintains the pH.
Homework Answers
The given buffer reaction: H2SO3 + HCO3- ----> H2CO3 + HSO3- and pH = pKa + log( HSO3- / H2SO3)
If small amount of HCl is added to the given buffer, then added HCl reacts with the equivalent amount of conjugate base, HSO3- according to following equation
HSO3- + HCl 
H2SO3 + Cl-
The above reaction results in the formation of undissociated H2SO3 (due to common ion effect). Therefore, the ratio of [HSO3-] /[ H2SO3] is changed slightly and the buffer maintains the pH.
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Consider the reaction: H2SO3 + HCO3- ----> H2CO3 + HSO3-
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