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Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

33.8K
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
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

35.3K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
35.3K
Titration of a Strong Acid with a Strong Base01:23

Titration of a Strong Acid with a Strong Base

10.1K
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
10.1K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

49.1K
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:
49.1K
Titration of a Weak Acid with a Strong Base01:30

Titration of a Weak Acid with a Strong Base

4.3K
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 Polyprotic Acids with a Strong Base01:23

Titration of Polyprotic Acids with a Strong Base

2.8K
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...
2.8K

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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
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An Injectable Strong Hydrogel for Bone Reconstruction.

Yanran Zhao1, Zhiyong Cui2, Bingchuan Liu2

  • 1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, China.

Advanced Healthcare Materials
|July 30, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel injectable hydrogel for bone defect repair. The composite double network hydrogel offers enhanced strength and promotes bone regeneration, outperforming traditional implants in vivo.

Keywords:
autostrengthening performancebone regenerationcomposite double-network hydrogelsinjectable scaffolds

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Engineering

Background:

  • Lack of injectable, mechanically robust, and osteogenic biomaterials for periarticular fracture bone defects.
  • Injectable hydrogels are ideal but often lack load-bearing capacity.
  • Need for materials providing structural support and promoting osteogenesis.

Purpose of the Study:

  • To develop an injectable composite double network (DN) hydrogel with enhanced mechanical properties and osteogenic capacity.
  • To create a biomaterial for effective treatment of bone defects in periarticular fractures.
  • To demonstrate the in vivo efficacy of the developed hydrogel.

Main Methods:

  • In situ formation of a composite double network (DN) hydrogel.
  • Utilizing 4-carboxyphenylboronic acid grafted poly(vinyl alcohol) (PVA) crosslinked with calcium ions for toughness.
  • Incorporating bioactive glass (BG) microspheres crosslinked with poly(ethylene glycol) for reinforcement.
  • Assessing mechanical properties (compressive strength, modulus, fracture energy) before and after mineralization.
  • Evaluating in vivo efficacy in treating femoral supracondylar bone defects.

Main Results:

  • The injectable PVA/BG DN hydrogel exhibited initial compressive strength of 34 MPa, modulus of 0.8 MPa, and fracture energy of 40 kJ m⁻².
  • Mineralization for 14 days "autostrengthened" properties to 57 MPa, 2 MPa, and 65 kJ m⁻².
  • In vivo studies showed superior treatment of femoral supracondylar bone defects compared to bulk DN gel.

Conclusions:

  • A facile strategy for creating strong, injectable hydrogels with tunable functionality was established.
  • The developed composite DN hydrogel shows significant potential for bone defect repair and regeneration.
  • This biomaterial offers a promising alternative for load-bearing applications in orthopedic treatments.