Flashcards on The pH Scale and Its Applications
The pH Scale and Its Applications: A Student Guide
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pH, Acidity and Alkalinity
21 cards
Card 1
Question: What does pH measure in a solution?
Answer: How acidic or alkaline (basic) the solution is, using numbers.
Card 2
Question: Who invented the pH scale and why?
Answer: Søren Peder Sørensen, a Danish chemist, invented it in 1909 to measure how acidic beer was.
Card 3
Question: What is the pH of a neutral substance like pure water?
Answer: pH 7 is neutral.
Card 4
Question: On the pH scale, what pH values indicate an acid and what values indicate an alkali?
Answer: Acids have pH less than 7; alkalis have pH greater than 7.
Card 5
Question: How does pH relate to how acidic or alkaline a solution is?
Answer: Lower pH means more acidic; higher pH means more alkaline.
Card 6
Question: Name one method to measure pH that gives a quick estimate.
Answer: Universal indicator paper or solution (mixture of indicators) gives a range of colours to estimate pH.
Card 7
Question: Name a more accurate method for measuring pH.
Answer: Using a pH meter.
Card 8
Question: What colours might a universal indicator show across the pH range?
Answer: Typical colours range from red, orange, yellow (acid) through green (neutral) to blue and purple (alkali).
Card 9
Question: Why is measuring pH important in the environment?
Answer: To check water and rain quality, detect acid pollution from factories, and protect wildlife and waterways.
Card 10
Question: What could cause acid rain and why is it harmful?
Answer: Pollution from factories producing acidic waste can cause acid rain, which can harm wildlife and waterways.