Problem: If the pKa of HCHO2 is 3.74 and the pH of an HCHO 2/NaCHO2 solution is 3.89, which of the following is true?A) [HCHO2] < [NaCHO2]B) [HCHO2] > [NaCHO2]C) [HCHO2] = [NaCHO2]D) [HCHO2] >> [NaCHO2]E) It is not possible to make a buffer of this pH from HCHO 2 and NaCHO2

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FREE Expert Solution

For this problem, we have to check which among the statements are true regarding a HCHO2/NaCHObuffer

Recall the Henderson-Hasselbalch equation:

pH=pKa+logconjugate baseweak acid

  • Using this particular equation, we can calculate or estimate pH by getting the pka and ratio of the concentration of the c.base (NaCHO2) and the weak acid (HCHO2)
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Problem Details

If the pKa of HCHO2 is 3.74 and the pH of an HCHO 2/NaCHO2 solution is 3.89, which of the following is true?

A) [HCHO2] < [NaCHO2]

B) [HCHO2] > [NaCHO2]

C) [HCHO2] = [NaCHO2]

D) [HCHO2] >> [NaCHO2]

E) It is not possible to make a buffer of this pH from HCHO 2 and NaCHO2