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PH and Indicators Chemistry Mrs. Coyle. Basic 14>ph>7 Neutral ph=7 Acidic 1

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Presentation on theme: "PH and Indicators Chemistry Mrs. Coyle. Basic 14>ph>7 Neutral ph=7 Acidic 1

1 pH and Indicators Chemistry Mrs. Coyle

2

3 Basic 14>ph>7 Neutral ph=7 Acidic 1

4 Self Ionization of H 2 O H 2 O  H + (aq) + OH - (aq) Ion Product Constant K w for Water: K w = [H + ] x [OH - ] =1.0 x

5 For pure H 2 O [H + ] = [OH - ] = 1.0 x M

6 pH 1909 Soren Sorensen (Danish) pH=-log[H + ] What is the pH of pure water?

7 Ex 1: Find the pH for [H + ]=10 -3 M Answer: pH=3

8 Ex 2: Find the pH for [H + ]=5x10 -3 M Answer: pH=2.3

9 Finding [H + ] from pH [H + ]= 10 -pH

10 Ex 3: Find the [H + ] for pH=5 Answer: [H + ] = M

11 Ex 4: Find the [H + ] for pH=5.8 [H + ]= 10 -pH Answer: [H + ] = 1.6x10 -6 M

12 pOH pH=-log[H + ] pH + pOH=14

13 Basic(Alkaline) Solutions Acidic Solutions Neutral Solutions

14 Acids Change phenolphthalein to colorless.

15 Acids Turn litmus paper from blue to red.

16 Bases Change phenolphthalein to pink.


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