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<p class="MsoPlainText"><span lang="EN-US" style="font-family:"Courier New"">Dear all,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-family:"Courier New"">The MHNC is a small natural history museum located in the hearth of the Jura Mountains in La Chaux-de-Fonds, Switzerland. The MHNC team is currently re-conditioning the alcohol collection,
changing containers and alcohol using an 80% Ethanol solution. The team was told to check the acidity of the alcoholic solution as acidity is not good for the specimens but had trouble doing so.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">Is a 9.6 mg/l acidity expressed as acetic acid too acidic? (12 mg/l in 96% Et-OH diluted to 4/5)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">Additional questions:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">The alcohol dealer was asked about the acidity of the 96% Ethanol he provides us with. The value he gave us is 12 mg/l of acidity expressed as acetic acid. We tried to calculate the pH
based on that value and obtain a value of 4.23. Does that sound right?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">We tried measuring the pH of the solution with both pH-paper and a pH-meter and found conflicting values. Is the pH-paper reading valid for an alcoholic solution? Or is the pH-meter value
valid for an alcoholic solution?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">A pH of 4.23 seems too acidic to preserve specimens so we tried to calculate the amount of Na2CO3 necessary to neutralize the 12 mg/l of CH3COOH and obtain 10.6 mg/l. Is it correct (and
sufficient) to add this amount of Na2CO3 to every liter of our 96% Et-OH solution?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">Any advice or help would be greatly appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">N<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*****************************************<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Nicolas Margraf <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Collaborateur scientifique<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Musée d'histoire naturelle de La Chaux-de-Fonds<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Av. Léopold-Robert 63 - CH 2300 LA CHAUX-DE-FONDS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">T +41 (0)32 967 60 71 -
<a href="mailto:mhnc@ne.ch"><span style="color:blue">mhnc@ne.ch</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">www.mhnc.ch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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