Solid Liquid Equilibrium
Solid Liquid Equilibrium - Related Videos
11:32
Vapor-liquid Equilibrium
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Vapor-liquid equilibrium is paramount in engineering applications such as distillation, environmental modeling, and general process design. Understanding the interactions of components in a mixture is very important in designing, operating and analyzing such separators. The activity coefficient is an excellent tool for relating molecular interactions to mixture...
09:32
Solid-Liquid Extraction
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2023
Source: Laboratory of Dr. Jay Deiner — City University of New York Extraction is a crucial step in most chemical analyses. It entails removing the analyte from its sample matrix and passing it into the phase required for spectroscopic or chromatographic identification and quantification. When the sample is a solid and the required phase for analysis is a liquid, the process is called solid-liquid extraction. A simple and broadly applicable form of solid-liquid extraction entails combining the...
07:19
Determining the Density of a Solid and Liquid
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2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology The ratio of the mass of a substance to its volume is known as the mass density or, simply, the density of the substance. Density is expressed in units of mass per volume, such as g/mL or kg/m3. Because the density of a substance does not depend on the amount of substance present, density is an “intensive property”. To measure the density of a sample of material, both the mass and volume of the sample must be determined.
02:26
Molecular Comparison of Gases, Liquids, and Solids
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2020
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
01:29
Liquid–Solid Solutions
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2026
The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
FAQs
Solid-liquid equilibrium is dynamic rather than motionless. Particles can leave the solid lattice and join the liquid while others return to the solid; equilibrium is reached when these opposing rates are equal. Because exchange continues, constant amounts of solid and liquid do not mean that individual particles remain in one phase. This distinction helps chemists interpret melting and freezing behavior.
Temperature changes can shift the balance between particles entering and leaving the solid phase, altering the relative amounts of solid and liquid. Composition also affects phase behavior in mixtures, so a transition may not be interpreted in the same way as it would for a single substance. These variables help explain why phase transitions depend on system conditions.
A phase diagram organizes the conditions under which solid and liquid phases occur and identifies regions where phase behavior changes. Chemists can use it to relate temperature and composition to the presence of each phase, rather than treating melting or freezing as isolated events. This makes phase diagrams useful for predicting transitions and analyzing mixtures.
During melting and freezing, molecular exchange changes the balance between the solid lattice and the liquid phase. The equilibrium perspective shows that these transitions reflect competing particle movements, not simply the disappearance or appearance of a phase without microscopic cause. Applying this view helps chemists connect observed phase changes with temperature and composition.
The equilibrium framework helps chemists interpret the temperature at which a substance changes between solid and liquid phases. By relating the observed transition to phase behavior, they can determine melting points and compare materials. These measurements provide useful information for material analysis and help distinguish how different substances respond to changing conditions.
Crystallization and purification depend on controlling whether material remains dissolved in a liquid or forms an organized solid phase. Solid-liquid equilibrium provides the basis for relating temperature and composition to that behavior. Chemists can therefore use the principle to design separation approaches, analyze mixtures, and control the formation of crystals during processing.