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In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH?
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In a volumetric estimation of HCl, if we make use of phenolphthalein a...
Unsuitable Base for HCl Titration with Phenolphthalein Indicator
Introduction
In a volumetric estimation of HCl, a suitable base is used to titrate the acid. The choice of base is important as it can affect the accuracy of the results. Phenolphthalein is a commonly used indicator in acid-base titrations as it changes color from colorless to pink at a pH of around 8.2.
Suitable Bases for HCl Titration with Phenolphthalein Indicator
The following bases are suitable for HCl titration with phenolphthalein indicator:
- Sodium hydroxide (NaOH)
- Potassium hydroxide (KOH)
- Rubidium hydroxide (RbOH)
- Ammonium hydroxide (NH4OH)
Unsuitable Base for HCl Titration with Phenolphthalein Indicator
Out of the four bases mentioned above, ammonium hydroxide (NH4OH) is unsuitable for HCl titration with phenolphthalein indicator.
Explanation
Ammonium hydroxide is a weak base and its dissociation in water is as follows:
NH4OH ⇌ NH4+ + OH-
In the titration of HCl with NH4OH, the following reaction takes place:
HCl + NH4OH → NH4Cl + H2O
However, since NH4OH is a weak base, its reaction with HCl will not be complete. This means that at the equivalence point, not all of the HCl will have reacted with NH4OH, and some of the HCl will remain unreacted. As a result, the pH of the solution will not be high enough to cause phenolphthalein to change color from colorless to pink. Therefore, the endpoint of the titration will not be accurately determined using phenolphthalein indicator.
Conclusion
In conclusion, ammonium hydroxide (NH4OH) is unsuitable for HCl titration with phenolphthalein indicator as it is a weak base and its reaction with HCl will not be complete. The other three bases mentioned above, namely sodium hydroxide (NaOH), potassium hydroxide (KOH), and rubidium hydroxide (RbOH) are suitable for HCl titration with phenolphthalein indicator.
Community Answer
In a volumetric estimation of HCl, if we make use of phenolphthalein a...
Explanation:Hph work on strong base.
Phenolphthalein use as indicators .
It is pink colour in basic medium and colourless in acidic medium,
So , in this NaOH,KOH,RbOH are strong base
And NH4OH Is weak base and it is correct answer
Phenolphthalein use as indicators .
It is pink colour in basic medium and colourless in acidic medium,
So , in this NaOH,KOH,RbOH are strong base
And NH4OH Is weak base and it is correct answer
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In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH?
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In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH?.
In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a volumetric estimation of HCl, if we make use of phenolphthalein as an indicator, which base is unsuitable for the titration A) NaOH B) RbOH C) KOH D) NH4OH?.
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