Formula Quiz Questions using -log(x)

[ThomasSnyder]

I am trying to build a formula question to calculate pH. The written formula in textbooks is: pH = -log[H+]

I haven't figured out how to use -log and have my variable for [H+].

I've tried the following:

     -logx

     -log x

     -log(x)

     -log[x]

All of these give invalid answers.

[lic · Accepted solution]

try -log(x,10).

There is a document with all the functions and their code http://bit.ly/cnvs-rce-quiz-formulas

Best of luck

Lisa