1. The pH Scale

2. Set up like this… Add 20ml of acid to small beaker… then using a pipette and referring to the pH scale… get the following colours (pHs) as quickly as you can… be careful.. Stir in each drop before you declare victory

3. Your challenge will be to make: Number 7,11,4,9,6 from the pH scale
Added MGN

4. The pH Scale

5. The pH Scale

6. The pH Scale

7. The pH Scale

8. The pH Scale

9. H+ OH- H+ + OH-  H2O What is in an Acid? What is in an Alkali?
Hydrochloric Acid HCl
Sulphuric Acid H2SO4
Nitric Acid HNO3
Ethanoic Acid CH3COOH
They all provide Hydrogen ions H+
Sodium Hydroxide NaOH
Potassium Hydroxide KOH
Magnesium Hydroxide MgOH
They all provide Hydroxide ions
OH-
In equal amount the two can combine to form water – a neutral substance
H+ + OH-  H2O

10. Balancing act…
Acid H+
Alkali
OH- H+
OH- H+
OH-
Neutral

11. Literacy task: Summarising
In 5 sentences summarise as much information as you can about what you have learned from this lesson.
H+ OH- Acid Alkali
Neutral pH Scale
Universal Indicator
Extra: (MGN)