Questions and Answers
What is the pH of substance A?
How much more acidic is substance B compared to substance A?
What is the pH of the unknown substance relative to substance C?
Which solution is indicated as slightly acidic based on the provided tables?
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What is the pH level of substance C?
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What color does Indicator A show at a pH of 6?
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Study Notes
pH Determination
- Four substances (A, B, C, D) were tested to determine the pH of an unknown substance.
- Substance A has a neutral pH of 7.
- Substance B is slightly acidic with a pH of 5.5 and is 100 times more acidic than substance A.
- Substance C is basic with a pH of 10.5 and is 100,000 times more acidic than substance B.
- Substance D is highly basic with a pH of 12.5.
- The unknown substance is 100 times more basic than substance C, indicating it has a pH above 12.5.
- Based on the pH scale, the unknown substance is classified as weakly alkaline.
Indicators and Acid-Base Solutions
- Indicator A shows a color change from yellow in acidic conditions (pH 2-5) to green (neutral at pH 6-7), and turns blue in more basic conditions (pH 10-12).
- Two indicators are referenced: Indicator A and Indicator B.
- Solution 1 is neutral according to Indicator A (green) but acidic according to Indicator B (red).
- Solution 2 is slightly acidic as demonstrated by Indicator A (yellow) and a neutral pink with Indicator B (rose).
- Solutions 3 and 4 show green and blue responses, indicating they are neutral or basic, respectively.
- Solution 2 is confirmed as slightly acidic based on the indicators used in the tests.
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Description
Test your knowledge on pH levels and acidity. This quiz examines various substances and their pH values, offering clues to deduce the acidity of an unknown substance. Understand the relationship between acidity and pH in a laboratory context.
