You have to prepare a pH 3.50 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4. Which solutions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer?

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cyanlocust121Lv1

28 Apr 2020

You have to prepare a pH 3.50 buffer, and you have the following 0.10 M solutions available: HCOOH, CH₃COOH, H₃PO₄, HCOONa, CH₃COONa, and NaH₂PO₄. Which solutions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer?

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You have 1 M solutions of H₃PO₄, NaH₂PO₄, Na₂HPO₄, Na₃PO₄ (no NaOH).

=> Using only two of these solutions, how would you prepare 150 mL of 1 M phosphate buffer at pH 3.0?

A)		131.4 mL of NaH₂PO₄ + 18.6 mL H₃PO₄
B)		50 mL Na₂HPO₄ + 100 mL Na₃PO₄
C)		75 mL Na₂HPO₄ + 75 mL Na₃PO₄
D)		18.6 mL of NaH₂PO₄ + 131.4 mL H₃PO₄

(a) Suppose you have two stock solutions 0.50 M CH3COOH and 0.50 M CH3COONa. Is these were mixed together would this be a buffer? (B)How many milliliters of sodium acetate do you need to add to obtain a pH of 5.45 if you start with 100 mL of acetic acid?

(a) Suppose you have two stock solutions 0.50 M CH3COOH and 0.50 M CH3COONa. Is these were mixed together would this be a buffer? How many milliliters of sodium acetate do you need to add to obtain a pH of 5.45 if you start with 100 mL of acetic acid? Ka = 1.8 X 10-5

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You have to prepare a pH 3.50 buffer, and you have the following 0.10 M solutions available: HCOOH, CH₃COOH, H₃PO₄, HCOONa, CH₃COONa, and NaH₂PO₄. Which solutions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer?

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