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Pararosaniline, pararosaniline free base, Basic Red 9, or C.I. 42500 is an organic compound with the formula (H 2 NC 6 H 4) 2 C=(C 6 H 4 NH). [1] It is the free base form of pararosaniline hydrochloride, [(H 2 NC 6 H 4) 3 C] + Cl −, a magenta solid with a variety of uses as a dye.
Fractional crystallisation can be used to obtain pure para product, relying on the principle that it is less soluble than the ortho and thus will crystallise first. Care must be taken to avoid cocrystallisation of the ortho isomer. [2] Many nitro compounds' ortho and para isomers have quite different boiling points. These isomers can often be ...
When concentrating an ammoniacal solution of tungstic acid (i.e. hydrous WO 3), the product obtained is ammonium paratungstate. Below 50 °C, the hexahydrate is formed, whereas when the temperature of the solution is above 50 °C, the pentahydrate or heptahydrate is formed. The former crystallizes as triclinic plates or prisms, whereas the ...
Hume-Rothery rules, named after William Hume-Rothery, are a set of basic rules that describe the conditions under which an element could dissolve in a metal, forming a solid solution. There are two sets of rules; one refers to substitutional solid solutions, and the other refers to interstitial solid solutions.
A solution of para-anisaldehyde in acid and ethanol is a useful stain in thin layer chromatography. [4] Different chemical compounds on the plate can give different colors, allowing easy distinction. DNA breakage
Top: The Brusselator in the unstable regime (A=1, B=3): The system approaches a limit cycle Bottom: The Brusselator in a stable regime with A=1 and B=1.7: For B<1+A 2 the system is stable and approaches a fixed point.
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The enthalpy of solution is the solution enthalpy minus the enthalpy of the separate systems, whereas the entropy of solution is the corresponding difference in entropy. The solvation energy (change in Gibbs free energy) is the change in enthalpy minus the product of temperature (in Kelvin) times the change in entropy. Gases have a negative ...