1. Acids and Bases pH- power of the hydrogen ion

2. Difference between them… Basically, acids are defined as compounds which give off H+ ions when you put them in water Bases are compounds that give off OH- ions in water

3. Properties of acids React with most metals for form hydrogen gas Taste sour Frequently feels sticky Usually in the form of gases or liquids

4. Properties of bases Feels slippery Taste bitter Reacts with oil and greases Frequently solids

5. The pH scale Measurement of H+ concentration in a liquid High concentration= acid 0-6 acid 0= strongly acidic 7 neutral. 6.99 is still “acidic” and 7.01 is “basic” 8-14 base 14= strong base

6. Our Mini Lab on Acids and Bases In this lab, you will predict and discover the relative pH of items easily found around the house Materials: tums, soap, washing detergent, coke, vinegar, baking soda, windex, lemonade, apple juice, milk, milk of magnesia, shampoo, distilled water

7. Your lab report You will turn in a chart YOU CREATE. ONLY turn in the chart Chart the following items: – Material name – Predicted pH – Color of red litmus paper – Color of blue litmus paper – Numeric result of pHydrion paper – Acid or base

8. Chart should look something like this

9. procedure Create chart. Make sure your name is on it Predict “acid or base” for each item Test each compound with red AND blue litmus paper Wait on everyone to finish Teacher will test each compound with pHydrion paper. Record numeric result Fill in “acid or base” column Discard litmus papers Turn in your chart

10. Indicator reference Chart Blue litmus will turn RED in the presence of an acid Blue litmus will remain BLUE in the presence of a base Red litmus will turn BLUE in the presence of a base Red litmus will remain RED in the presence of an acid