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.  I addressed this in lecture.  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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