CPR Inorganic pH

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pH

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The Scale

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

ACID         NEUTRAL            BASE

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In water a H+ may be transferred from one H O molecule to another, creating a hydronium ion H O+ , and a hydroxide ion OH-

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Equal amounts are created so water is generally neutral overall.

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pH

The equation for pH is:

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and

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Generally one mole of water contains                moles of H O+ ions.

Therefore the pH of water is 7

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Using the Exponentials

If [H O+] = 1x10   moles dm then the pH is 7.

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If [H O+] = 1x10   moles dm then the pH is -7.

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The smaller the pH the more acidic, the larger the pH the more basic.

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If we don't know the[H O+] we can usually use the ionic product of water (K )

K  = [H O+] [OH-]

    =  [1x10 ] [1x10 ]

    = 1x10

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Useful Equations

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Common pH's

Acids: Gastric juice = 1

           Lemon juice = 2.3

           Orange juice = 3.5

           Coffee = 5

           Milk = 6.6

Bases: Blood = 7.4

            Tears = 7.4

            Sea water = 8

            Baking soda = 8.4

            Domestos = 12.5

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