The Amazing pH Scale Adventure

A Journey Through Acids and Alkalis Year 7 Science Understanding pH in Everyday Life

What Does pH Actually Mean?

pH stands for 'potential of Hydrogen' It measures how acidic or alkaline a substance is Scientists use numbers from 0 to 14 It helps us understand everyday chemicals safely

The pH Scale: 0 to 14

Quick Think!

Look at this scale... Where do you think lemon juice would go? What about soap? How about pure water?

Acids: The Sour Squad (pH 0-6)

Acids taste sour (but never taste chemicals!) They can be found in citrus fruits Stomach acid helps digest food Car batteries contain very strong acid

Neutral Zone: Perfect Balance (pH 7)

Neutral means 'in the middle' Pure water is perfectly neutral Not acidic, not alkaline Like a perfectly balanced seesaw!

Alkalis: The Bitter Bunch (pH 8-14)

Alkalis feel slippery like soap They taste bitter (but don't taste them!) Toothpaste is a mild alkali Oven cleaner is a very strong alkali

pH Detective Challenge!

Match these everyday items to their pH: Coca Cola (pH 3) Baking Soda (pH 9) Milk (pH 6.5) Which is most acidic? Which is most alkaline?

How Do We Measure pH?

Universal indicator paper changes color pH meters give exact numbers Different colors = different pH values Red = very acidic, Blue = very alkaline

Remember This!

The pH scale helps us understand the world around us safely! From the food we eat to the products we use Science makes the invisible visible