# Problem: If a biochemist wishes to prepare a buffer that will be effective at a pH of 3.0 (at 25°C) for studying peptide degradation, what will be the best choice for the acid component? (a) Oxalic acid (H2C2O4), Ka = 5.9 x 10 -2 (b) Hydrofluoric acid (HF), Ka = 6.6 x 10 -4 (c) Pyridinium ion (HC5H5N+ ), Ka = 5.6 x 10 -6 (d) Hypochlorous acid (HClO), Ka = 3.0 x 10 -8 (e) Hydrocyanic acid (HCN), Ka = 6.17 x 10 -10

80% (41 ratings)
###### Problem Details

If a biochemist wishes to prepare a buffer that will be effective at a pH of 3.0 (at 25°C) for studying peptide degradation, what will be the best choice for the acid component?

(a) Oxalic acid (H2C2O4), Ka = 5.9 x 10 -2

(b) Hydrofluoric acid (HF), Ka = 6.6 x 10 -4

(c) Pyridinium ion (HC5H5N+ ), Ka = 5.6 x 10 -6

(d) Hypochlorous acid (HClO), Ka = 3.0 x 10 -8

(e) Hydrocyanic acid (HCN), Ka = 6.17 x 10 -10

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Buffer concept. You can view video lessons to learn Buffer. Or if you need more Buffer practice, you can also practice Buffer practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofIf a biochemist wishes to prepare a buffer that will be effe...as high difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 3 minutes and 19 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Horsthemke's class at SMU.