Question #2d0ea

1 Answer
Oct 27, 2016

Answer:

Here's how I would do it.

Explanation:

The carbonic acid/hydrogen carbonate buffer is by far the most important buffer for maintaining acid-base balance in the blood.

We have the following equilibrium:

#"H"_2"CO"_3"(aq)" + "H"_2"O(l)" ⇌ "HCO"_3^"-""(aq)" + "H"_3"O"^+"(aq)"; "p"K_text(a) = "6.10 at 37 °C"#

The Henderson-Hasselbalch equation is

#color(blue)(bar(ul(|color(white)(a/a) "pH" = "p"K_"a" + log(("[HCO"_3^"-""]")/("[H"_2"CO"_3"]"))color(white)(a/a)|)))" "#

Normal blood plasma is 24 mmol/L in #"HCO"_3^"-"# and 1.2 mmol/L in #"H"_2"CO"_3#.

#"pH" = 6.10 + log((24 color(red)(cancel(color(black)("mmol/L"))))/(1.2 color(red)(cancel(color(black)("mmol/L"))))) = 6.10 + 1.30 = 7.40#