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					pH Scale   Kiranjot Minhas
 Shine a penny
 Which solution will work the best?

                    1.Control variable
                     ( time, volume of the liquid)
                    2. Independent variable
                        (pennies)
                    3. Dependent variable
                     (strength of the solution)
Make a scale according to potential of solutions
How do I write pH?

 pH……………………………….

   PH…………………………………

     Ph…………………………………
What can pH do?
             What can pH do?




http://en.wikipedia.org/wiki/PH
What can pH do ?

            For Healthy Crops
            farmers need to
            monitor soil pH

             Use pH and EC pens
             to Monitor
             Greenhouse crop
             nutrition
   Be an Informed Citizen
pH advantage products




Check Your pH Balance - Free Reports
pH and Industry.
• Drinking water purification
• Sugarmanufacture
• Sewage treatment
• Milkpreservation
•Brightness of chrome coating on auto
  bumpers
• Swimming pool technician
pH Change Everything in our body


          Blood pH 7.35 – 7.45.

           Stomach pH
           (Hydrochloric acid) between pH 1 - 3

          Skin pH between 4.5-6

 www.EvenBetterHealth.com
         But Why not???
            Dilute same as weak

           Concentrated same as Strong
p://http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/acid13
How Do I measure pH?
Technology can help!!

Digital pH meter and pH probe
Use molarity of the solution to
find H+ ion concentration and compare
        OR
 Learn to use your calculator
 pH= -log [H+] at 25o C
               I am confused

1.Value of 0 means there is nothing there in the
   solution. pH scale starts from #1 and go to
   #14
 Have them look at a Ruler Scale
2. pH scale value can only be minimum 0 and
   maximum 14

 pH can go to a negative value and can also
 exceed #14 in some cases
               I am confused??

3. Bases are not corrosive only acids are deadly
   Watch frying of eggs with acid and base on
   the overhead stove 

4. All strong smelling liquids are acids
    Have them smell ammonia for strong
    smell of base
                I am confused??
5. One drop of acid in glassful of water is nothing

Observe the change in pH value of solution by
adding one drop of strong acid to water

6. Salt solutions are always neutral

 Include a salt solution e.g. FeCl3 for testing pH
             I am confused??


7. In dilution why mixing water to acid is dangerous?
   Needs to know the exothermic nature of the
   reaction.

8. Why is pH value 1 stronger acid than pH value 2

  Needs operational thinking
             Review

Please have your writing tool and a paper
  ready to write a quiz

				
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posted:9/15/2011
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