PH SCALE. A scale of values that show how basic or acidic a substance is based on an assigned number

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Presentation transcript:

pH SCALE

A scale of values that show how basic or acidic a substance is based on an assigned number Strongest

You have a glass of orange juice that has a pH of 3. What can you conclude about the orange juice? It is an ACID You have some drain cleaner that has a pH of What can you conclude? It is a BASE You have some distilled water. What can you conclude about the pH? It is NEUTRAL, so pH = 7

Which of the following substances would definitely have a pH under 7? H 2 SO 4 HClH2OH2O CaCl 2 CH 4 KOHMg(OH) 2 pH under 7 = ACIDS

5 X 10 x 10 x 10 x 10….and so on If substance A has a pH of 1 & substance B has a pH of 3, which is MORE ACIDIC? Substance A – it is actually 100 times more acidic!!!

Rank from most acidic to least acidic:  Vinegar pH 2  Bleach pH 13  Milk pH 6.5  Coffee pH 5 VinegarMilkBleachCoffee Least acidic Most acidic

Rank from least basic to most basic:  Blood pH 7.4  Sea Water pH 8  Bananas pH 5  Drain Cleaner pH 13.5 BananasSea WaterDrain CleanerBlood Most Basic Least Basic

Indicators are chemical dyes that turn different colours when they are placed in acidic and alkaline (basic) solutions