[thedy]

Hi,I m absolutely confused,so every answer is welcome.
So to the topic,in this equation:G=ΔG+RTln[C][D]/[A][ B] is logarithm?But what is the purpose of it?How chemists found out,that in this equation have to be logarithm?I know,logarithm can be negative and we can have sometimes a case,when ΔG is positive but G can be negative due logarithm,but next is what?
Thanks for answers and any links,were I can find answer.

[thedy]

Or I try to reformulate my question.
For example,let have deltaG positive and lnK<0---that means in some case,we can have positive deltaG but negative G.But if we convert lnK to exponential form,then we get positive value and G will be positive.So,how it is possible?The same conditions in chemistry,but changed in math and we get totally another value of physical(chemical) stuff.
Sorry for my confused question,but I don know how to explain it better.
So can we convert to exponentional form?In this equation?
Thanks