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Related Concept Videos

Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Calculating pH Changes in a Buffer Solution02:45

Calculating pH Changes in a Buffer Solution

A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...

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Related Experiment Video

Updated: Jun 2, 2026

Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry
03:37

Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry

Published on: June 6, 2025

Stabilizing sodium hypochlorite at high pH: effects on soft tissue and dentin.

Holger Jungbluth1, Monika Marending, Gustavo De-Deus

  • 1Division of Preventive Dentistry, University of Zürich Center of Dental Medicine, Switzerland.

Journal of Endodontics
|April 19, 2011
PubMed
Summary

Stabilizing sodium hypochlorite (NaOCl) solutions at a high pH significantly enhances their ability to dissolve soft tissue and affect dentin. This high-pH NaOCl demonstrates greater proteolytic action compared to standard solutions.

Related Experiment Videos

Last Updated: Jun 2, 2026

Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry
03:37

Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry

Published on: June 6, 2025

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Biochemistry

Background:

  • Sodium hypochlorite (NaOCl) solutions are commonly used in endodontics.
  • NaOCl solutions experience a pH drop and reduced tissue sorption upon reaction with tissue.
  • Investigating high-pH stabilized NaOCl could improve its efficacy.

Purpose of the Study:

  • To evaluate the soft-tissue dissolution capacity of high-pH stabilized NaOCl.
  • To assess the effects of stabilized NaOCl on the dentin matrix.
  • To compare stabilized NaOCl with standard NaOCl solutions.

Main Methods:

  • Prepared standard and NaOH-stabilized 5% NaOCl solutions.
  • Assessed alkaline capacity using HCl titration.
  • Tested soft-tissue dissolution and dentin mechanical properties (modulus of elasticity, flexural strength).

Main Results:

  • Stabilized NaOCl exhibited significantly higher alkaline capacity than standard NaOCl.
  • Stabilized NaOCl dissolved more soft tissue while maintaining a high pH.
  • Stabilized NaOCl significantly reduced dentin's elastic modulus and flexural strength.

Conclusions:

  • NaOH-stabilized NaOCl solutions possess superior alkaline capacity.
  • Stabilized NaOCl solutions are more proteolytic than standard NaOCl.
  • High-pH NaOCl shows enhanced tissue dissolution and dentin modification.