dear, can anyone guide me what will be protocol for the quantification of citric acid and oxalic acid from the fermentation broth using titration technique. means quantification from a mixture of oxalic and citric acid.
No protocol and not titration. But as I seem to recall (its been >50 years) there was a spectrophotometric method using malonic acid. Check old versions of the AOAC.
The titration curve for citric acid ― NaOH can be predicted from the following:
About predicting the pH of citric acid ― sodium citrate solutions and buffers for approx. pH < 4.0 ― cf. my post at:
https://www.researchgate.net/post/How-to-prepare-a-citric-acid-solution-of-pH-25-and-3-from-100-citric-acid-powder
About predicting the pH of citric acid ― sodium citrate solutions and buffers for approx. 4.0 < pH < 5.5 ― cf. my posts at: https://www.researchgate.net/post/Why-the-pH-of-Citrate-buffer-increases-when-diluted-with-water
About predicting the pH of citric acid ― sodium citrate solutions and buffers for approx. 5.5 < pH < 8.0 ― cf. my posts at: https://www.researchgate.net/post/Why-the-pH-of-Citrate-buffer-increases-when-diluted-with-water
About predicting the pH of citric acid ― sodium citrate solutions and buffers for approx. pH > 8.0 ― and for approx. pH > 9.0 ― cf. my posts at:
https://www.researchgate.net/post/Why-the-pH-of-Citrate-buffer-increases-when-diluted-with-water
About pH or titration of mixed acid solutions at RG:
About the titration of a mixed phosphoric acid / sulfuric acid aq. solution with sodium hydroxide aq. solution; cf. my posts at:
https://www.researchgate.net/post/What_are_some_of_the_precautions_I_need_to_exercise_while_making_a_solution_of_sulfuric_acid_and_phosphoric_acid
About the pH for sodium acetate / acetic acid solutions with added hydrochloric acid; cf. my posts at:
https://www.researchgate.net/post/Can-hydrochloric-acid-be-used-to-acidify-sodium-acetate
About the pH of mixed lactic acid /sodium lactate and acetic acid / sodium acetate solutions or buffers ― also with strong monoprotic acid added; cf. my posts at:
https://www.researchgate.net/post/any_explanation_about_the_leveling_effect_of_titration_of_sodium_lactate_in_acetic_acid_with_perchloric_acid
About the pH of mixed H2SO4―HNO3 aq. solutions:
https://www.researchgate.net/post/Do-you-know-a-method-for-titration-of-HNO3-H2SO4-mixtures
On the pH of mixed H2SO4―HCl and H2SO4―HCl―HI aq. sol.:
https://www.researchgate.net/post/How_do_you_calculate_pH_with_different_types_of_acids_in_solution
About mixed citric acid / sodium citrate with nitrous acid / sodium nitrite solutions or buffers:
https://www.researchgate.net/post/How-do-I-calculate-the-mass-of-citric-acid-to-add-to-a-NaNO2-solution-to-reach-a-certain-pH
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