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Published byDaryl Ghrist Modified over 10 years ago
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pH and Indicators Chemistry Mrs. Coyle
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Basic 14>ph>7 Neutral ph=7 Acidic 1<pH<7
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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 10 -14
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For pure H 2 O [H + ] = [OH - ] = 1.0 x 10 -7 M
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pH 1909 Soren Sorensen (Danish) pH=-log[H + ] What is the pH of pure water?
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Ex 1: Find the pH for [H + ]=10 -3 M Answer: pH=3
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Ex 2: Find the pH for [H + ]=5x10 -3 M Answer: pH=2.3
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Finding [H + ] from pH [H + ]= 10 -pH
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Ex 3: Find the [H + ] for pH=5 Answer: [H + ] = 10 -5 M
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Ex 4: Find the [H + ] for pH=5.8 [H + ]= 10 -pH Answer: [H + ] = 1.6x10 -6 M
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pOH pH=-log[H + ] pH + pOH=14
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Basic(Alkaline) Solutions Acidic Solutions Neutral Solutions
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Acids Change phenolphthalein to colorless.
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Acids Turn litmus paper from blue to red.
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Bases Change phenolphthalein to pink.
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