pH Scale Facts
What number on the pH scale is neutral?
7
Name one property of acids.
Sour taste, corrosive, turn blue litmus red
What tool shows a range of pH values by colour?
Universal Indicator
What safety equipment must always be worn during labs?
Goggles
Why is pH testing important in food science?
Prevents spoilage and ensures safety
What does a pH less than 7 mean?
Acidic solution
Name one property of bases.
Bitter taste, slippery, turn red litmus blue
What colour does pH paper turn in an acid?
Red/Yellow/Orange
What should you do if you spill a chemical?
Tell the teacher and clean safely
Why is blood pH important?
Must stay near 7.4 for health
What does a pH greater than 7 mean?
Basic/alkaline solution
Which is an acid: vinegar or baking soda?
Vinegar
What colour does pH paper turn in a base?
Blue/purple
What is one source of error in the pH lab?
Misreading colour charts
Why do farmers add lime to soil?
To reduce acidity and improve growth
Each step on the pH scale represents a change by a factor of __?
10
Which is a base: lemon juice or soap?
Soap
What is an example of a natural indicator?
Red cabbage juice
Why should droppers not touch samples?
To avoid cross-contamination
What workplace uses pH to monitor pool safety?
Recreation/pool maintenance
What is the pH of pure water?
7
What type of ions do bases release in water?
Hydroxide ions (OH-)
Why do we use indicators in the lab?
To identify the pH of solutions
Why is it important to record exact colours and numbers?
Ensures accurate data and comparisons
What medicine neutralizes stomach acid?
Antiacids