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A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:
- a)green
- b)yellow
- c)red
- d)blue
Correct answer is option 'A'. Can you explain this answer?
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A student tested the pH of distilled water and found that the colour o...
Distilled Water:
When distilled water is tested with pH paper, the color change indicates the pH level of the water. pH paper is a type of indicator paper that changes color depending on the acidity or alkalinity of a substance. In this case, the color change to green suggests that the pH of distilled water is neutral.
Neutral pH:
A neutral pH is typically indicated by a green color on pH paper. A pH of 7 is considered neutral, meaning that the substance is neither acidic nor alkaline. Distilled water, which is pure water, has a pH of around 7.
Adding Common Salt:
When a pinch of common salt is dissolved in water, it dissociates into its constituent ions: sodium (Na+) and chloride (Cl-). These ions can interact with water molecules through a process called ionization.
Ionization of Salt:
The ionization of salt in water leads to the formation of hydrogen ions (H+) and hydroxide ions (OH-). The hydrogen ions make the solution slightly acidic, while the hydroxide ions make it slightly alkaline.
Effect on pH:
The addition of common salt does not significantly change the pH of water. The pH paper will still indicate a neutral pH, which is represented by the color green. This is because the concentration of hydrogen ions and hydroxide ions produced by the ionization of salt is relatively low and does not shift the pH towards acidity or alkalinity.
Conclusion:
In summary, when distilled water is tested with pH paper, it changes to green, indicating a neutral pH. Adding a pinch of common salt to the water does not significantly alter the pH, and the pH paper will still show a green color.
When distilled water is tested with pH paper, the color change indicates the pH level of the water. pH paper is a type of indicator paper that changes color depending on the acidity or alkalinity of a substance. In this case, the color change to green suggests that the pH of distilled water is neutral.
Neutral pH:
A neutral pH is typically indicated by a green color on pH paper. A pH of 7 is considered neutral, meaning that the substance is neither acidic nor alkaline. Distilled water, which is pure water, has a pH of around 7.
Adding Common Salt:
When a pinch of common salt is dissolved in water, it dissociates into its constituent ions: sodium (Na+) and chloride (Cl-). These ions can interact with water molecules through a process called ionization.
Ionization of Salt:
The ionization of salt in water leads to the formation of hydrogen ions (H+) and hydroxide ions (OH-). The hydrogen ions make the solution slightly acidic, while the hydroxide ions make it slightly alkaline.
Effect on pH:
The addition of common salt does not significantly change the pH of water. The pH paper will still indicate a neutral pH, which is represented by the color green. This is because the concentration of hydrogen ions and hydroxide ions produced by the ionization of salt is relatively low and does not shift the pH towards acidity or alkalinity.
Conclusion:
In summary, when distilled water is tested with pH paper, it changes to green, indicating a neutral pH. Adding a pinch of common salt to the water does not significantly alter the pH, and the pH paper will still show a green color.
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Community Answer
A student tested the pH of distilled water and found that the colour o...
The colour of the pH paper must have remained green. Sodium chloride (NaCl) is a salt of strong base (NaOH) and strong acid (HCl). It dissolves in water to give a neutral solution which is just like distilled water. Therefore, the colour of pH paper remained green.
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A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer?
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A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer?.
A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer?.
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A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of A student tested the pH of distilled water and found that the colour of pH paper changed to green. He checked the pH again after dissolving a pinch of common salt in water. The colour of the pH paper this time was:a)greenb)yellowc)redd)blueCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
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