What would be the composition and ph of an ideal buffer prepared from lactic acid (ch3chohco2h), where the hydrogen atom highlighted in boldface is the acidic hydrogen atom? the ka value for lactic acid is 1.38 × 10−4.\?

Explanation:

first write the equilibrium equaion ,

 ⇄

assuming degree of dissociation =1/10;

and initial concentraion of =c;

At equlibrium ;

concentration of

is very small so can be neglected

and equation is;

=

composiion ;

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.