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PH. A- What is pH? A1.pH represents the concentration of H + in a solution A2.pH = the power of Hydrogen pH = -log 10 [H + ] A3.Lower pH means higher.

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Presentation on theme: "PH. A- What is pH? A1.pH represents the concentration of H + in a solution A2.pH = the power of Hydrogen pH = -log 10 [H + ] A3.Lower pH means higher."— Presentation transcript:

1 pH

2 A- What is pH? A1.pH represents the concentration of H + in a solution A2.pH = the power of Hydrogen pH = -log 10 [H + ] A3.Lower pH means higher H + concentration

3 B- What is pH used for? B1.pH tells how acidic or basic a solution is B2.Very acidic solution has low pH value B3.Very basic solution has high pH value

4 C1. pH scale lies from 0 (very acidic) to 14 (very basic) C2. Neutral solution has pH =7

5 D- pH and soil D1.Corn and small grains prefer pH 5-6 (acidic? neutral? Or basic?) D2. it’s slightly acidic -D3.Potatoes and blueberries prefer pH < 5 (acidic? neutral? Or basic?) -D4. it’s basic

6 E- Hydrangea color E1- Blue flowers if in acidic soil (pH <5.5) E2- Pink flowers if in basic soil (pH> 6.5)

7 F- pH and Cosmetics F1. Our skin has a pH of 5.5 F2. What can you infer about our skin? F3. Why is it necessary to have pH 5.5? F4.High pH cosmetic products can remove layers of dead cells, making skin look brighter and clearer. Occasional use only

8 G. How to test pH? pH paper G2.Indicators G1.pH meter Red cabbage juice

9 H. pH paper H1. Litmus paper: H2. Litmus: an indicator from lichen H3. 2 kinds: blue and red H4. Acids turns blue litmus to red H5. Bases turns red litmus to blue

10 I. pH paper with universal indicator I1.Paper dipped in mixture of many indicators that produce different color at different pH I2.Acids turn pH paper to red/orange color I3.Bases turn pH paper to blue/green color

11 J- Natural indicator J1. Natural indicator: such as red cabbage juice

12 K. Other indicators K1. Color of bromothymol blue =? when pH =13

13 Lab Read the pH of common household substances using both: -pH paper -natural indicator (i.e. red cabbage juice)


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