Which of the following gives a buffer solution when equal volumes of the two sol

Question

Which of the following gives a buffer solution when equal volumes of the two solutions are mixed? Check all that apply. Use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.220M NaHCOs and 0.130M Na2COs. Ka values are given in Appendix C ) Express your answer using three significant figures Give a recipe for preparing a CH3CO2H - CH3CO2Na buffer solution that has pH = 4.58. Express your answer using two significant figures. The solution should have n = mole of CH3C0 per mole of CH3CO2H.

Explanation / Answer

1> ans is 4

2>pH = pKa + log [Na2CO3]/[NaHCO3] = 10.3 + log((0.13)/(0.22)) = 10.072

3>1.259

pH= pKa + log10([salt]/[acid])

pKA acetic acid is 4.75

4.85 = 4.75 + log10([CH3COONa]/[CH3COOH])

[CH3COONa]/[CH3COOH] = 1.259

mole ratio of CH3COONa/CH3COOH = 1.259

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