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How do we determine pH using the pH probe |
<table>
<tr><td>Short Description:</td>
<td>Students will determine the pH of various solutions</td></tr>
<tr><td>Duration of Lesson:</td>
<td>1 Class Period</td></tr>
<tr><td>Grade Levels:</td>
<td> High 9-12</td></tr>
<tr><td>Subjects:</td>
<td> Biology</td></tr>
<tr><td>Technologies used in Lesson:</td>
<td> Computer</td></tr>
<tr><td>
Online Tutorial:</td>
<td>
</td></tr>
</table>
<p><span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>How<span style='mso-spacerun:yes'> </span>do</span></span><span
lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:10.0pt'> we<span
style='mso-spacerun:yes'> </span>determine<span
style='mso-spacerun:yes'> </span>pH<span style='mso-spacerun:yes'>
</span>using<span style='mso-spacerun:yes'> </span>the<span
style='mso-spacerun:yes'> </span>pH<span style='mso-spacerun:yes'>
</span>Probe and<span style='mso-spacerun:yes'> </span>the computer?</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Motivation: Determine the pH of <span>various<span
style='mso-spacerun:yes'> </span>solutions</span>, including liquids</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><span
style='mso-spacerun:yes'>
</span>We<span style='mso-spacerun:yes'> </span>ingest.</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Problem<span>:All</span><span
style='mso-spacerun:yes'> </span>substances<span
style='mso-spacerun:yes'> </span>that can dissolve<span
style='mso-spacerun:yes'> </span>in water will dissolve only at specific
pHs. What is the pH of of liquids that we commonly use or</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Ingest in our environment</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Materials: pH probe; <span>laptop<span
style='mso-spacerun:yes'> </span>computer</span>; salt solution,vinegar,
dissolved</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><span style='mso-tab-count:2'> </span>Vitamin
C<span>;<span style='mso-spacerun:yes'> </span>distilled</span>
water; tap water; lemon juice; orange</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><span style='mso-tab-count:2'> </span>Juice;
<span>bottled<span style='mso-spacerun:yes'> </span>water</span>;
hydrochloric<span style='mso-spacerun:yes'> </span>acid; sodium<span
style='mso-spacerun:yes'> </span>hydoxide;</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><span style='mso-tab-count:2'> </span><span>Ammonia<span style='mso-spacerun:yes'> </span>water</span>.<span
style='mso-spacerun:yes'> </span><span>50 ml beakers.</span></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Development:</span></p>
<p style='margin-left:.75in;text-indent:-.25in;mso-list:l1 level1 lfo1;
tab-stops:list .75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Students will attach the pH probe to the computer
and set up the</span></p>
<p style='margin-left:.5in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'>The exercise on <span>the<span
style='mso-spacerun:yes'> </span>computer</span> in order<span
style='mso-spacerun:yes'> </span>to record the pH of all the</span></p>
<p style='margin-left:.5in'><span><span lang=EN-US
style='font-size:14.0pt;mso-bidi-font-size:10.0pt'>Selected solutions.</span></span><span
lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:10.0pt'></span></p>
<p style='margin-left:.75in;text-indent:-.25in;mso-list:l1 level1 lfo1;
tab-stops:list .75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>The results will be entered in the computer and
analyzed , based</span></p>
<p style='margin-left:.75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'>On the pH scale as to which solution is acid,
base, or neutral and</span></p>
<p style='margin-left:.75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'>How strong or weak is the acid or base.</span></p>
<p style='margin-left:.75in;text-indent:-.25in;mso-list:l1 level1 lfo1;
tab-stops:list .75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>A table will be prepared comparing the<span
style='mso-spacerun:yes'> </span>pHs of the solutions</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p style='margin-left:.75in;text-indent:-.25in;mso-list:l1 level1 lfo1;
tab-stops:list .75in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>4)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>The students are to answer the following questions:</span></p>
<p style='margin-left:1.25in;text-indent:-.25in;mso-list:l1 level2 lfo1;
tab-stops:list 1.25in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>a)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>What is the pH scale</span></p>
<p style='margin-left:1.25in;text-indent:-.25in;mso-list:l1 level2 lfo1;
tab-stops:list 1.25in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>b)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>What makes a solution acid, basic<span>,or</span>
neutral?</span></p>
<p style='margin-left:1.25in;text-indent:-.25in;mso-list:l1 level2 lfo1;
tab-stops:list 1.25in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>c)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Why is it important to know if a solution is acid,
base, or neutral?</span></p>
<p style='margin-left:1.25in;text-indent:-.25in;mso-list:l1 level2 lfo1;
tab-stops:list 1.25in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>d)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Why is pH important in the functioning of enzymes?</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Results:<span style='mso-spacerun:yes'> </span>Students will
print out or copy the table comparing the results of the solutions.</span></p>
<p style='margin-left:1.0in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'><o:p> </o:p></span></p>
<p style='margin-left:1.0in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'><o:p> </o:p></span></p>
<p style='margin-left:1.0in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'><o:p> </o:p></span></p>
<p style='margin-left:1.0in'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt'><o:p> </o:p></span></p>
<p style='margin-left:1.0in'><span><span
lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:10.0pt'>Steps<span
style='mso-spacerun:yes'> </span>for</span></span><span lang=EN-US
style='font-size:14.0pt;mso-bidi-font-size:10.0pt'><span
style='mso-spacerun:yes'> </span>starting<span
style='mso-spacerun:yes'> </span>computer<span
style='mso-spacerun:yes'> </span>and<span style='mso-spacerun:yes'>
</span>program</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>1-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Go<span style='mso-spacerun:yes'>
</span>to<span style='mso-spacerun:yes'> </span>logo<span
style='mso-spacerun:yes'> </span>pro<span style='mso-spacerun:yes'>
</span>icon</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>2-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Hook<span style='mso-spacerun:yes'>
</span>up<span style='mso-spacerun:yes'> </span>to third<span
style='mso-spacerun:yes'> </span>slot<span
style='mso-spacerun:yes'> </span>and<span style='mso-spacerun:yes'>
</span>vernier lab pro</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>3-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Hook<span style='mso-spacerun:yes'>
</span>up<span style='mso-spacerun:yes'> </span>electrode<span
style='mso-spacerun:yes'> </span>to<span style='mso-spacerun:yes'>
</span>vernier lab<span style='mso-spacerun:yes'> </span>pro</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>4-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Click on<span style='mso-spacerun:yes'>
</span>ok tip</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>5-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Automatic pH graph<span
style='mso-spacerun:yes'> </span>appears</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>6-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Go<span style='mso-spacerun:yes'>
</span>to<span style='mso-spacerun:yes'> </span>file<span
style='mso-spacerun:yes'> </span>open</span></p>
<p style='margin-left:91.0pt;text-indent:-19.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 91.0pt'><span lang=EN-US style='font-size:
14.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-family:Times'><span
style='mso-list:Ignore'>7-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><span lang=EN-US style='font-size:14.0pt;
mso-bidi-font-size:10.0pt'>Click<span style='mso-spacerun:yes'>
</span>on<span style='mso-spacerun:yes'> </span>experiment 5<span
style='mso-spacerun:yes'> </span>soil<span
style='mso-spacerun:yes'> </span>study<span
style='mso-spacerun:yes'> </span>and proceed<span
style='mso-spacerun:yes'> </span>with demo</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'>Summary:<span style='mso-spacerun:yes'> </span>How can we measure
<span>the<span style='mso-spacerun:yes'> </span>pH</span> of
a variety<span style='mso-spacerun:yes'> </span>of solutions and solid</span></p>
<p><span lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:
10.0pt'><span style='mso-tab-count:2'> </span><span>Substances?</span></span></p>
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