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For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-?
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For preparing a buffer solution of pH = 7, which buffer system will u ...
**Buffer Solution and pH**
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base (or a weak base and its conjugate acid) in a specific ratio. Buffer solutions are important in various biological and chemical processes as they help to maintain a stable pH.
The pH of a solution is a measure of its acidity or alkalinity. It is determined by the concentration of hydrogen ions (H+) present in the solution. A pH of 7 is considered neutral, meaning the solution is neither acidic nor alkaline.
**Choosing the Buffer System**
To prepare a buffer solution with a pH of 7, we need to select a suitable buffer system. Let's analyze the options given:
A) H3PO4, H2PO4-
This option involves phosphoric acid (H3PO4) and dihydrogen phosphate ion (H2PO4-). Phosphoric acid is a triprotic acid, meaning it can donate three protons (H+ ions). The acid dissociation constants for phosphoric acid are Ka1, Ka2, and Ka3, corresponding to the loss of the first, second, and third protons, respectively. The pKa values for these dissociation constants are approximately 2.15, 7.20, and 12.35. In this buffer system, the ratio of H3PO4 to H2PO4- is crucial for maintaining the desired pH of 7. However, the pKa2 value of 7.20 indicates that at pH 7, the majority of phosphoric acid will be in the H2PO4- form. Therefore, this buffer system is not suitable for preparing a pH 7 buffer.
B) H2PO4-, HPO4^2-
This option involves dihydrogen phosphate ion (H2PO4-) and monohydrogen phosphate ion (HPO4^2-). Both ions are conjugate pairs of phosphoric acid. The pKa value for the dissociation of H2PO4- to HPO4^2- is around 7.20, which matches the desired pH of 7. This indicates that at pH 7, the concentration of H2PO4- and HPO4^2- will be approximately equal. Therefore, this buffer system is suitable for preparing a pH 7 buffer.
C) HPO4^2-, PO4^3-
This option involves monohydrogen phosphate ion (HPO4^2-) and phosphate ion (PO4^3-). The pKa value for the dissociation of HPO4^2- to PO4^3- is around 12.35, indicating that at pH 7, the majority of the ions will be in the HPO4^2- form. This buffer system is not suitable for preparing a pH 7 buffer.
D) H3PO4, PO4^3-
This option involves phosphoric acid (H3PO4) and phosphate ion (PO4^3-). As discussed earlier, phosphoric acid is a triprotic acid with three dissociation constants. At pH 7, the majority of phosphoric acid will be in the H2PO4- form rather than the PO4^3- form. Therefore, this buffer system is not suitable for preparing a pH
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base (or a weak base and its conjugate acid) in a specific ratio. Buffer solutions are important in various biological and chemical processes as they help to maintain a stable pH.
The pH of a solution is a measure of its acidity or alkalinity. It is determined by the concentration of hydrogen ions (H+) present in the solution. A pH of 7 is considered neutral, meaning the solution is neither acidic nor alkaline.
**Choosing the Buffer System**
To prepare a buffer solution with a pH of 7, we need to select a suitable buffer system. Let's analyze the options given:
A) H3PO4, H2PO4-
This option involves phosphoric acid (H3PO4) and dihydrogen phosphate ion (H2PO4-). Phosphoric acid is a triprotic acid, meaning it can donate three protons (H+ ions). The acid dissociation constants for phosphoric acid are Ka1, Ka2, and Ka3, corresponding to the loss of the first, second, and third protons, respectively. The pKa values for these dissociation constants are approximately 2.15, 7.20, and 12.35. In this buffer system, the ratio of H3PO4 to H2PO4- is crucial for maintaining the desired pH of 7. However, the pKa2 value of 7.20 indicates that at pH 7, the majority of phosphoric acid will be in the H2PO4- form. Therefore, this buffer system is not suitable for preparing a pH 7 buffer.
B) H2PO4-, HPO4^2-
This option involves dihydrogen phosphate ion (H2PO4-) and monohydrogen phosphate ion (HPO4^2-). Both ions are conjugate pairs of phosphoric acid. The pKa value for the dissociation of H2PO4- to HPO4^2- is around 7.20, which matches the desired pH of 7. This indicates that at pH 7, the concentration of H2PO4- and HPO4^2- will be approximately equal. Therefore, this buffer system is suitable for preparing a pH 7 buffer.
C) HPO4^2-, PO4^3-
This option involves monohydrogen phosphate ion (HPO4^2-) and phosphate ion (PO4^3-). The pKa value for the dissociation of HPO4^2- to PO4^3- is around 12.35, indicating that at pH 7, the majority of the ions will be in the HPO4^2- form. This buffer system is not suitable for preparing a pH 7 buffer.
D) H3PO4, PO4^3-
This option involves phosphoric acid (H3PO4) and phosphate ion (PO4^3-). As discussed earlier, phosphoric acid is a triprotic acid with three dissociation constants. At pH 7, the majority of phosphoric acid will be in the H2PO4- form rather than the PO4^3- form. Therefore, this buffer system is not suitable for preparing a pH
Community Answer
For preparing a buffer solution of pH = 7, which buffer system will u ...
I think ans should be B
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For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-?
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For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-?.
For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For preparing a buffer solution of pH = 7, which buffer system will u choose A) H3PO4, H2PO4^- B) H2PO4^-, HPO4^2- C) HPO4^2-, PO4^3- D) H3PO4, PO4^3-?.
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