Which one of these five solutions would be expected in theory to have the highest buffering...

Question

Question

Which one of these five solutions would be expected in theory to have the highest buffering capacity with respect to strong acid?

1) 3 mL of 0.50M Na2CO3 & 27mL of 0.50M NaHCO3

2) 9mL of 0.50M Na2CO3 & 21mL of of 0.50M NaHCO3

3) 15 mL of 0.50M Na2CO3 & 15mL of 0.50M NaHCO3

4) 21 mL of 0.50M Na2CO3 & 9mL of 0.50M NaHCO3

5) 27 mL of 0.50M Na2CO3 & 3mL of 0.50M NaHCO3

Answer 1

Answer #1

answer : 5) 27 mL of 0.50M Na2CO3 & 3mL of 0.50M NaHCO3

explanation:

we know that on addition of strong acid to the buffer it can react with basic component

here Na2CO3 is the basic component .

we have to look into only Na2CO3 because of net reaction

CO32- + H+ ------------------> HCO3-

higher volume will have more capacity because all have same concentrations 0.5 M

so answer will be 5) it has higher volume

Answer 2

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