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LecturePLUS Timberlake1 8.2 & 8.3 – Acids, Bases & the pH Scale.

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Presentation on theme: "LecturePLUS Timberlake1 8.2 & 8.3 – Acids, Bases & the pH Scale."— Presentation transcript:

1 LecturePLUS Timberlake1 8.2 & 8.3 – Acids, Bases & the pH Scale

2 LecturePLUS Timberlake2 Acids and Bases Acids produce H + in aqueous solutions water HCl H + (aq) + Cl - (aq) Bases produce OH - in aqueous solutions water NaOH Na + (aq) + OH - (aq)

3 LecturePLUS Timberlake3 Acids þ Produce H + ions in water þ Produce a negative ion (-) too þ Taste sour þ Corrode metals þ React with bases to form salts and water þ Are electrolytes þ Turn blue litmus paper red

4 LecturePLUS Timberlake4 Some Common Acids HCl hydrochloric acid HNO 3 nitric acid H 3 PO 4 phosphor ic acid H 2 SO 4 sulfur ic acid CH 3 COOH acet ic acid

5 LecturePLUS Timberlake5 Bases Produce OH - ions in water Taste bitter, chalky Are electrolytes Feel soapy, slippery React with acids to form salts and water Turn red litmus paper blue

6 LecturePLUS Timberlake6 Some Common Bases NaOHsodium hydroxide KOH potassium hydroxide Ba(OH) 2 barium hydroxide Mg(OH) 2 magnesium hydroxide Al(OH) 3 aluminum hydroxide

7 The pH Scale –the pH scale is a scale from 0 to 14 which represents how acidic or basic a solution is –pH stands for “power of hydrogen”; the mathematical expression is pH = - log [H + ] –Acidic solutions have a pH below 7 (0-6.5) –Basic solutions have a pH above 7 (7.5-14) –Neutral solutions have a pH equal to 7 ( ) 19.2

8 The pH Concept –pH and Significant Figures 19.2


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