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Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

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Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
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Titration of a Weak Acid with a Strong Base01:30

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In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...
4.3K
Titration of a Weak Base with a Strong Acid01:20

Titration of a Weak Base with a Strong Acid

8.6K
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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Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

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Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
33.8K
Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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High-Speed Ultraviolet Photoacoustic Microscopy for Histological Imaging with Virtual-Staining assisted by Deep Learning
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Mejora de la interpretabilidad del aprendizaje profundo para la clasificación de imágenes histológicas guiada por

Zong Fan1, Changjie Lu1, Jialin Yue2

  • 1University of Illinois Urbana-Champaign, Department of Bioengineering, Urbana, Illinois, United States.

Journal of medical imaging (Bellingham, Wash.)
|January 22, 2026
PubMed
Resumen

Este estudio presenta un marco de generalización de débil a fuerte (WSG) para mejorar los modelos de aprendizaje profundo (DL) para el análisis de imágenes histológicas. La integración de características diseñadas a mano (HCF) mejora la interpretabilidad y el rendimiento predictivo del modelo DL para la adopción clínica.

Palabras clave:
modelado de características de aprendizaje profundointerpretabilidad de característicasmodelado de características diseñadas a manoclasificación de imágenes histológicas completasgeneralización de débil a fuerte

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Área de la Ciencia:

  • Patología computacional
  • Inteligencia artificial en medicina
  • Análisis de imágenes

Sus antecedentes:

  • Los modelos de aprendizaje profundo (DL) sobresalen en el análisis de imágenes histológicas pero carecen de interpretabilidad.
  • Las características diseñadas a mano (HCF) ofrecen interpretabilidad pero tienen un menor poder predictivo.
  • La relación entre DL y HCF está poco explorada, lo que dificulta la adopción clínica.

Objetivo del estudio:

  • Mejorar la interpretabilidad y el rendimiento del modelo DL en el análisis de imágenes histológicas.
  • Integrar HCF en modelos DL utilizando un marco de generalización de débil a fuerte (WSG).
  • Explorar la correlación entre DL y HCF para una mejor adopción clínica.

Principales métodos:

  • Se desarrolló un marco WSG con un modelo 'débil' interpretable basado en HCF que supervisa un modelo 'fuerte' de estudiante DL.
  • Se diseñó una función de pérdida WSG de bootstrap adaptativa para optimizar la transferencia de conocimiento de HCF a características DL.
  • Se analizó la información mutua (MI) entre HCF y características DL para evaluar la interpretabilidad y las correlaciones.

Principales resultados:

  • El marco WSG mejoró consistentemente el rendimiento de la clasificación en varios modelos.
  • El análisis del mapa de saliencia mostró que la supervisión WSG mejoró el enfoque del modelo en regiones de diagnóstico relevantes.
  • El análisis cuantitativo reveló un aumento de la MI entre las HCF y las características de DL después del entrenamiento WSG.

Conclusiones:

  • El marco WSG integra eficazmente las HCF en el entrenamiento DL, mejorando la interpretabilidad y el rendimiento predictivo.
  • Se dilucidaron las HCF clave que impulsan las predicciones DL en la clasificación de imágenes histológicas.
  • Los hallazgos respaldan una adopción clínica más amplia de modelos DL interpretables en patología.