A sodium hydrogen carbonate/sodium carbonate buffer system is to be prepared with a pH of 9.7.  The relevant pKa value can be obtained from your textbook. What is the [HCO3-]/[CO32-] ratio in this buffer solution? What volume of 0.198 M NaHCO3 must be added to 765 mL of a 0.123 M Na2CO3 to obtain this pH? What volume of 0.089 M HCl must be added to 765 mL of 0.123 M Na2CO3 to obtain this pH?

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Chapter1: Chemical Foundations
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  1. A sodium hydrogen carbonate/sodium carbonate buffer system is to be prepared with a pH of 9.7.  The relevant pKa value can be obtained from your textbook.
    1. What is the [HCO3-]/[CO32-] ratio in this buffer solution?
    2. What volume of 0.198 M NaHCO3 must be added to 765 mL of a 0.123 M Na2CO3 to obtain this pH?
    3. What volume of 0.089 M HCl must be added to 765 mL of 0.123 M Na2CO3 to obtain this pH?
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