A 1.0 L buffer solution is 0.250 mol L-1 CH3COOH and 0.050 mol ...

[LaDunn]

Question 1

Which of the following acids (listed with Ka values) and their conjugate base would be the best choice to make a buffer with a pH of 2.34?
◦ HClO2, Ka = 1.1 × 10-2
◦ C6H5COOH, Ka = 6.5 × 10-5
◦ HClO, Ka = 2.9 × 10-8
◦ HCN, Ka = 4.9 × 10-10
◦ HF, Ka = 3.5 × 10-4

Question 2

A 1.0 L buffer solution is 0.250 mol L-1 CH3COOH and 0.050 mol L-1 CH3COOLi. Which of the following actions will exceed the capacity of the buffer?
◦ adding 0.050 moles of CH3COOH
◦ adding 0.050 moles of HCl
◦ adding 0.050 moles of CH3COOLi
◦ adding 0.050 moles of NaCl
◦ adding 0.050 moles of NH4Cl

[dantucker]

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[LaDunn]

Thanks for the timely response, appreciate it

[olderstudent]

Wow, this really help