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Which chemical indicator turns water into pink colour, if the pH is more than 8.3.
- a)Bromothymol blue
- b)Murexide
- c)Phenolphthalein
- d)Methyl orange
Correct answer is option 'C'. Can you explain this answer?
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Which chemical indicator turns water into pink colour, if the pH is mo...
pH of the water can also be measured by certain indicators:
1.Phenolphthalein: Phenolphthalein indicator works in the pH range of 8.6-10.3. Phenolphthalein is often used as an indicator in acid-base titrations. For this application, it turns colourless in acidic solutions and pink in basic solutions, that's why if the pH of the water is more than 8.3 it turns the water into pink colour.
2.Methyl orange: Methyl orange indicator works in the pH range of 2.8-4.4. The original colour of this indicator is red and the final colour is yellow.
Most Upvoted Answer
Which chemical indicator turns water into pink colour, if the pH is mo...
Chemical Indicator for pH
The chemical indicator that turns water into a pink color when the pH is more than 8.3 is phenolphthalein (option C).
Explanation
Chemical indicators are substances that change color in response to changes in pH. They are often used in titrations and other laboratory tests to determine the acidity or alkalinity of a solution.
Phenolphthalein
Phenolphthalein is a commonly used chemical indicator that is colorless in acidic solutions and turns pink in basic solutions. It has a pH range of approximately 8.3 to 10.0.
Color Change
When phenolphthalein is added to water with a pH higher than 8.3, the solution will turn pink. This is because phenolphthalein is a weak acid that dissociates in basic solutions, resulting in a pink color.
pH Scale
The pH scale is a measure of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being neutral. Solutions with a pH less than 7 are acidic, while solutions with a pH greater than 7 are basic or alkaline.
Other Options
The other chemical indicators listed in the options are:
- Bromothymol blue: This indicator turns yellow in acidic solutions and blue in basic solutions. It has a pH range of approximately 6.0 to 7.6.
- Murexide: This indicator is commonly used in complexometric titrations and does not specifically change color at pH 8.3.
- Methyl orange: This indicator turns red in acidic solutions and yellow in basic solutions. It has a pH range of approximately 3.1 to 4.4.
Therefore, the correct answer is option C, phenolphthalein, as it is the indicator that turns water into a pink color when the pH is more than 8.3.
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Which chemical indicator turns water into pink colour, if the pH is more than 8.3.a)Bromothymol blueb)Murexidec)Phenolphthaleind)Methyl orangeCorrect answer is option 'C'. Can you explain this answer?
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