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Indicators02:39

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Titration of Polyprotic Base with a Strong Acid01:18

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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...
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Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

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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...
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pH01:24

pH

139.3K
The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
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Titration of a Weak Base with a Strong Acid01:20

Titration of a Weak Base with a Strong Acid

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The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
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Precipitation Titration: Endpoint Detection Methods01:19

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2.2K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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An unexpected dual-response pH probe based on acridine.

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A novel fluorescent probe, TBN, effectively monitors extreme pH levels. This probe shows linear responses in both highly acidic and alkaline conditions, offering perfect emission properties.

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Area of Science:

  • Analytical Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Accurate pH monitoring is crucial in various scientific disciplines.
  • Existing fluorescent probes often struggle with performance in extreme pH environments.
  • Tröger's base derivatives offer potential for novel chemical sensor development.

Purpose of the Study:

  • To develop and characterize a new fluorescent probe for extreme pH detection.
  • To evaluate the pH-dependent behavior and emission properties of the novel probe.
  • To demonstrate the utility of the probe in monitoring both highly acidic and alkaline conditions.

Main Methods:

  • Synthesis of the novel fluorescent probe 2,8-bis(acridin-9-ylethynyl)-6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine (TBN).
  • Spectroscopic analysis to determine the probe's fluorescence response across a wide pH range.
  • Testing the probe's linearity and stability in extreme acidic (pH 1.4-3.4) and alkaline (pH 12.5-15.0) conditions.

Main Results:

  • TBN exhibits excellent pH-dependent fluorescence behavior.
  • The probe demonstrates a linear response in the extreme acidic range of 1.4-3.4.
  • TBN shows a linear response in the extreme alkaline range of 12.5-15.0.
  • The probe possesses ideal emission properties under extreme pH conditions.

Conclusions:

  • TBN is a novel and effective fluorescent probe for monitoring extreme pH.
  • The probe's single functional group enables perfect emission in harsh acidic and alkaline environments.
  • TBN represents a significant advancement in fluorescent sensing technology for extreme pH applications.