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How to match the buffer solution of ammonium oxalate?
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Mike Bauer
How to match the buffer solution of ammonium oxalate?
First of all, you have to determine the pH value of the buffer, and then according to the unbuttoning constant PKA, select the reasonable coexistence acid and alkali pairs, bring the volume of the solution you need to prepare to calculateIt's right. For example: How much is the oxalic acid and sodium oxalate for pH u003d 4.49 500ml to configure the buffer solution?
PKA1 u003d 1.23, PKA2 u003d 4.19 Obviously PKA2 is closer to the target pH, so the common acid and alkali pairs should be selected for HC2O4-and C2O4^2- According to the pH pH of the buffer solution pHCalculation formula: pH u003d pka-lg (C acid/C base) get 4.49 u003d 4.19-lg (C acid/C base) C acid/C base u003d 0.50 Cavoral solution C (NAHC2O4): C (Na2C2O4) u003d 1: 2
If the volume of the buffer solution is 500ml, it can be calculated that requires the volume of H2C2O4 solution to 187.5ml ]
First of all, you have to determine the pH value of the buffer, and then according to the unbuttoning constant PKA, select the reasonable coexistence acid and alkali pairs, bring the volume of the solution you need to prepare to calculateIt's right. For example: How much is the oxalic acid and sodium oxalate for pH u003d 4.49 500ml to configure the buffer solution?
PKA1 u003d 1.23, PKA2 u003d 4.19 Obviously PKA2 is closer to the target pH, so the common acid and alkali pairs should be selected for HC2O4-and C2O4^2- According to the pH pH of the buffer solution pHCalculation formula: pH u003d pka-lg (C acid/C base) get 4.49 u003d 4.19-lg (C acid/C base) C acid/C base u003d 0.50 Cavoral solution C (NAHC2O4): C (Na2C2O4) u003d 1: 2
If the volume of the buffer solution is 500ml, it can be calculated that requires the volume of H2C2O4 solution to 187.5ml ]
For example: How much is the oxalic acid and sodium oxalate for pH u003d 4.49 500ml to configure the buffer solution?
PKA1 u003d 1.23, PKA2 u003d 4.19
Obviously PKA2 is closer to the target pH, so the common acid and alkali pairs should be selected for HC2O4-and C2O4^2-
According to the pH pH of the buffer solution pHCalculation formula:
pH u003d pka-lg (C acid/C base) get 4.49 u003d 4.19-lg (C acid/C base)
C acid/C base u003d 0.50
Cavoral solution C (NAHC2O4): C (Na2C2O4) u003d 1: 2
If the volume of the buffer solution is 500ml, it can be calculated that
requires the volume of H2C2O4 solution to 187.5ml
]
For example: How much is the oxalic acid and sodium oxalate for pH u003d 4.49 500ml to configure the buffer solution?
PKA1 u003d 1.23, PKA2 u003d 4.19
Obviously PKA2 is closer to the target pH, so the common acid and alkali pairs should be selected for HC2O4-and C2O4^2-
According to the pH pH of the buffer solution pHCalculation formula:
pH u003d pka-lg (C acid/C base) get 4.49 u003d 4.19-lg (C acid/C base)
C acid/C base u003d 0.50
Cavoral solution C (NAHC2O4): C (Na2C2O4) u003d 1: 2
If the volume of the buffer solution is 500ml, it can be calculated that
requires the volume of H2C2O4 solution to 187.5ml
]
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