<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Arial",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
.MsoPapDefault
{mso-style-type:export-only;
mso-margin-top-alt:auto;
mso-margin-bottom-alt:auto;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">For the BAR lab you needed to calculate ln[Allura Red]. The sig. fig. for
<br>
log(x) and ln(x) are tricky. It's explained in a help file I have specifically<br>
about logs and s.f. at my "Helpful Tidbit" link. Sig. fig. for logarithms is<br>
also explained in Appendix A of the textbook. This is also very important<br>
for ch 16, 17 since you have to take base ten logs to get pH, pOH, etc.<br>
I mentioned this in lecture during our discussion of pH and pOH. We’ll<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">be dealing with logs again in chapters 19 and 20. These pesky little<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">things are popping up everywhere.<br>
<br>
<a href="https://www.asc.ohio-state.edu/zellmer.1/chem1220/faq/sig_fig_logs.txt"><b>Manipulating Logs and Sig. Figs.</b></a><br>
<br>
Dr. Zellmer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
</div>
</body>
</html>