Why is it possible to have a concentrated weak acid?

1 Answer
May 18, 2017

Answer:

Because #"concentration"# refers to the amount of solute present in a given volume of #"solution.........."#

Explanation:

#"Acetic acid"#, #"H"_3"CCO"_2"H"#, CERTAINLY behaves as a weak acid in water, i.e. the following equilibrium lies to the left as we face the page:

#"H"_3"CCO"_2"H" +"H"_2"O"rightleftharpoons"H"_3"CCO"_2^(-) +"H"_3"O"^+#

This equilibrium may be carefully measured, and......................

#K_a=(["H"_3"CCO"_2^(-)]["H"_3"O"^+])/(["H"_3"CCO"_2"H"])=10^(-4.76)#

Glacial acetic acid (i.e. very pure acetic acid), has a concentration of #15.5*mol*L^-1#; of course the description of acidity requires dissolution in water.............