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What is an impurity?
An impurity is a substance that is present in a material or compound in small amounts, but can affect its properties, purity, or function. Impurities can come from various sources such as contamination during processing, byproducts of reactions, or intentional additions for specific purposes. Control and removal of impurities are important in various industries, including pharmaceuticals, electronics, and chemicals.
If boron is contained as an impurity in a diamond what colour is it?
If boron is contained as an impurity in a diamond, it can impart a blue color to the diamond. This type of diamond is often referred to as a blue diamond and is very rare and highly valued.
Which serve as a donor impurity in silicon?
Common donor impurities in silicon include phosphorus and arsenic. These impurities have one more valence electron than silicon, making them donate an extra electron to the silicon crystal lattice, resulting in n-type doping.
Why should the recrystallization solvent have a fairly low boiling point?
Using a recrystallization solvent with a low boiling point allows for easy removal of the solvent by evaporation, facilitating the formation of pure crystals. It also helps prevent the loss of desired compound during the purification process.
Difference between co precipitation and post precipitation?
In chemistry, coprecipitation (CPT) or co-precipitation is the carrying down by a precipitate of substances normally soluble under the conditions employed.[1] Analogously, in medicine, coprecipitation is specifically the precipitation of an unbound "antigen along with an antigen-antibody compleThere are three main mechanisms of coprecipitation: inclusion, occlusion, and adsorption.[3] An inclusion occurs when the impurity occupies a lattice site in the crystal structure of the carrier, resulting in a crystallographic defect; this can happen when the ionic radius and charge of the impurity are similar to those of the carrier. An adsorbate is an impurity that is weakly bound (adsorbed) to the surface of the precipitate. An occlusion occurs when an adsorbed impurity gets physically trapped inside the crystal as it grows.Besides its applications in chemical analysis and in radiochemistry, coprecipitation is also "potentially important to many environmental issues closely related to water resources, including acid mine drainage, radionuclide migration in fouled waste repositories, metal contaminant transport at industrial and defense sites, metal concentrations in aquatic systems, and wastewater treatment technology"[4].Coprecipitation is also used as a method of magnetic nanoparticle synthesis.[5]
