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Which of the following is not an acidic buffer?
- a)Acetic Acid-Sodium acetate
- b)Boric acid-borax
- c)Ammonium hydroxide-ammonium chloride
- d)All are acidic buffers
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not an acidic buffer?a)Acetic Acid-Sodium ac...
Acidic Buffer
An acidic buffer is a solution that resists changes in pH when small amounts of an acid or base are added to it. It contains a weak acid and its conjugate base. The weak acid can donate a proton (H+) to neutralize added base, while the conjugate base can accept a proton to neutralize added acid.
Examples of Acidic Buffers
a) Acetic Acid-Sodium acetate: It is a common acidic buffer used in biochemistry and molecular biology. It has a pKa value of 4.76 and is effective in the pH range of 4.5-5.5.
b) Boric acid-borax: It is another acidic buffer commonly used in biochemistry and molecular biology. It has a pKa value of 9.24 and is effective in the pH range of 8.2-9.2.
c) Ammonium hydroxide-ammonium chloride: This is not an acidic buffer but a basic buffer. It contains a weak base (ammonia) and its conjugate acid (ammonium chloride).
Why Ammonium Hydroxide-Ammonium Chloride is not an acidic buffer?
An acidic buffer contains a weak acid and its conjugate base. However, ammonium hydroxide is a weak base and ammonium chloride is its conjugate acid. Therefore, it is a basic buffer, not an acidic buffer. It can resist changes in pH when small amounts of an acid or base are added to it in the pH range of 8.2-9.2.
Conclusion
In conclusion, the correct answer is option 'C', Ammonium hydroxide-ammonium chloride, is not an acidic buffer. It is a basic buffer containing a weak base and its conjugate acid.
An acidic buffer is a solution that resists changes in pH when small amounts of an acid or base are added to it. It contains a weak acid and its conjugate base. The weak acid can donate a proton (H+) to neutralize added base, while the conjugate base can accept a proton to neutralize added acid.
Examples of Acidic Buffers
a) Acetic Acid-Sodium acetate: It is a common acidic buffer used in biochemistry and molecular biology. It has a pKa value of 4.76 and is effective in the pH range of 4.5-5.5.
b) Boric acid-borax: It is another acidic buffer commonly used in biochemistry and molecular biology. It has a pKa value of 9.24 and is effective in the pH range of 8.2-9.2.
c) Ammonium hydroxide-ammonium chloride: This is not an acidic buffer but a basic buffer. It contains a weak base (ammonia) and its conjugate acid (ammonium chloride).
Why Ammonium Hydroxide-Ammonium Chloride is not an acidic buffer?
An acidic buffer contains a weak acid and its conjugate base. However, ammonium hydroxide is a weak base and ammonium chloride is its conjugate acid. Therefore, it is a basic buffer, not an acidic buffer. It can resist changes in pH when small amounts of an acid or base are added to it in the pH range of 8.2-9.2.
Conclusion
In conclusion, the correct answer is option 'C', Ammonium hydroxide-ammonium chloride, is not an acidic buffer. It is a basic buffer containing a weak base and its conjugate acid.
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Which of the following is not an acidic buffer?a)Acetic Acid-Sodium ac...
An acidic buffer has a pH value of less than 7, Acetic Acid-Sodium Acetate and boric acid-borax are examples of acidic buffers, but ammonium Hydroxide-ammonium chloride has a pH of greater than 7, so they are basic buffers.
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Which of the following is not an acidic buffer?a)Acetic Acid-Sodium acetateb)Boric acid-boraxc)Ammonium hydroxide-ammonium chlorided)All are acidic buffersCorrect answer is option 'C'. Can you explain this answer?
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