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Titration of Polyprotic Acids with a Strong Base01:23

Titration of Polyprotic Acids with a Strong Base

1.8K
Titration of a polyprotic acid, which contains multiple ionizable protons, involves distinct dissociation steps, each with its own dissociation constant (Ka). Each successive Ka is weaker than the previous one. In the titration of a polyprotic acid like sulfurous acid with a strong base such as sodium hydroxide, the base first neutralizes the initial ionizable proton, forming an intermediate species (e.g., hydrogen sulfite ions). This step's titration curve resembles that of a weak...
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Titration of a Polyprotic Acid02:08

Titration of a Polyprotic Acid

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A polyprotic acid contains more than one ionizable hydrogen and undergoes a stepwise ionization process.  If the acid dissociation constants of the ionizable protons differ sufficiently from each other, then the titration curve for such polyprotic acid generates a distinct equivalence point for each of its ionizable hydrogens. Therefore, titration of a diprotic acid results in the formation of two equivalence points, whereas the titration of a triprotic acid results in the formation of three...
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Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

2.8K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
2.8K
Polyprotic Acids03:38

Polyprotic Acids

29.2K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.2K
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

794
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
794
Composition of Polyprotic Acid Solutions as a Function of pH01:19

Composition of Polyprotic Acid Solutions as a Function of pH

519
Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of...
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Updated: Jul 1, 2025

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase
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Alkaptonuria.

Giulia Bernardini1, Daniela Braconi2, Andrea Zatkova3,4

  • 1Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Siena, Italy. giulia.bernardini@unisi.it.

Nature Reviews. Disease Primers
|March 7, 2024
PubMed
Summary
This summary is machine-generated.

Alkaptonuria is a rare metabolic disorder causing homogentisic acid (HGA) buildup, leading to debilitating symptoms like ochronosis and osteoarthropathy. Early diagnosis and multidisciplinary management are crucial for improving patient quality of life.

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Alkaptonuria (AKU) is a rare autosomal recessive metabolic disorder.
  • Caused by homogentisate 1,2-dioxygenase deficiency, leading to homogentisic acid (HGA) accumulation.
  • Characterized by ochronosis, osteoarthropathy, and multisystemic complications.

Purpose of the Study:

  • To provide a comprehensive overview of Alkaptonuria.
  • To highlight diagnostic challenges and the need for early intervention.
  • To discuss current management strategies and future research directions.

Main Methods:

  • Literature review of Alkaptonuria research.
  • Analysis of clinical manifestations and disease progression.
  • Summary of treatment approaches and precision medicine.

Main Results:

  • HGA accumulation results in dark urine, ochronosis, and severe osteoarthropathy.
  • Variable clinical manifestations include kidney stones and aortic stenosis.
  • Delayed diagnosis is common due to non-specific symptoms.

Conclusions:

  • Alkaptonuria requires a multidisciplinary approach for effective management.
  • Patient-tailored treatments combining medication, physical therapy, and surgery are essential.
  • Ongoing research aims to improve patient care and develop innovative therapies.