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A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is :
- a)lemon juice
- b)sodium bicarbonate solution
- c)distilled water
- d)hydrochloric acid
Correct answer is option 'B'. Can you explain this answer?
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A drop of a liquid sample was put on the pH paper. It was observed tha...
Understanding pH Indicators
pH paper is a simple tool used to determine the acidity or basicity of a solution. It contains dyes that change color depending on the pH level of the solution being tested.
Color Change on pH Paper
- **Blue Color Indication**: The blue color on pH paper indicates that the solution is basic (alkaline) with a pH greater than 7.
- **Acidic Solutions**: Solutions like lemon juice (pH around 2), hydrochloric acid (pH around 1), and even distilled water (pH around 7) would not turn the paper blue; they would typically turn it red or show no change, respectively.
Analysis of the Options
- **Lemon Juice**: This is acidic (pH ~2) and would turn the pH paper red.
- **Sodium Bicarbonate Solution (Correct Answer)**: This is a basic solution (pH ~9) which would turn the pH paper blue.
- **Distilled Water**: It has a neutral pH of about 7 and would not change the color of the pH paper significantly.
- **Hydrochloric Acid**: Being highly acidic (pH ~1), this would also turn the pH paper red.
Conclusion
The observation of blue color on the pH paper is a clear indication that the liquid sample is a basic solution. Among the provided options, sodium bicarbonate solution is the only one that aligns with this observation, confirming it as the correct answer.
pH paper is a simple tool used to determine the acidity or basicity of a solution. It contains dyes that change color depending on the pH level of the solution being tested.
Color Change on pH Paper
- **Blue Color Indication**: The blue color on pH paper indicates that the solution is basic (alkaline) with a pH greater than 7.
- **Acidic Solutions**: Solutions like lemon juice (pH around 2), hydrochloric acid (pH around 1), and even distilled water (pH around 7) would not turn the paper blue; they would typically turn it red or show no change, respectively.
Analysis of the Options
- **Lemon Juice**: This is acidic (pH ~2) and would turn the pH paper red.
- **Sodium Bicarbonate Solution (Correct Answer)**: This is a basic solution (pH ~9) which would turn the pH paper blue.
- **Distilled Water**: It has a neutral pH of about 7 and would not change the color of the pH paper significantly.
- **Hydrochloric Acid**: Being highly acidic (pH ~1), this would also turn the pH paper red.
Conclusion
The observation of blue color on the pH paper is a clear indication that the liquid sample is a basic solution. Among the provided options, sodium bicarbonate solution is the only one that aligns with this observation, confirming it as the correct answer.
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A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is :a)lemon juiceb)sodium bicarbonate solutionc)distilled waterd)hydrochloric acidCorrect answer is option 'B'. Can you explain this answer?
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