Question

D.1.To create a buffer that has a pH around 7.54, which solution would you choose A....

D.1.To create a buffer that has a pH around 7.54, which solution would you choose

A. Ch3COOH and NaCH3COO

B. HClO and KClO

C. NaOH and HCN

D. HNO3 and KNO3

2. Calculate the pH after 10.0mL of 0.400 M NaOH is added to 20.0mL of 0.50M CH3COOH. (Ka of CH3COOH is 1.8 * 10^-5)

3. What is the pH of a solution that contains 1 L of 0.10M CH3COOH and .080 M NaCH3COO after .03 moles of NaOH added

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Homework Answers

Answer #1

To create a buffer that has a pH around 7.54, is depending on the value of pKa OF ACIDS.

Acid / base mixture                                            pKa values

A. CH3COOH and NaCH3COO                      4.74

B. HClO and KClO                                  7.54

C. NaOH and HCN                                   9.31

D. HNO3 and KNO3                                3.34

To best buffer [base] / [acid[ ratio must be b/w -1 to +1.

pH = pKa + or – 1

and

pH = pKa + log [salt or base]/ [Acid]

thus the correct answers is B B. HClO and KClO                                7.54

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