BAR - sig. fig. for logs

[robert zellmer]

In the BAR report you need to calculate ln[Allura Red].  The sig. fig. for
log(x) and ln(x) are tricky.  It's explained in a help file I have 
specifically
about logs and s.f. at my "Helpful Tidbit" link.  Sig. fig. for 
logarithms is
also explained in Appendix A of the textbook.  This is also very important
for ch 16 and 17 since you have to take base ten logs to get pH, pOH, etc.

*Manipulating Logs and Sig. Figs.* 
<https://www.asc.ohio-state.edu/zellmer.1/chem1220/faq/sig_fig_logs.txt>

Dr. Zellmer
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