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The chelate effect increases as the number of chelate rings increases. For example, the complex [Ni(dien) 2)] 2+ is more stable than the complex [Ni(en) 3)] 2+; both complexes are octahedral with six nitrogen atoms around the nickel ion, but dien (diethylenetriamine, 1,4,7-triazaheptane) is a tridentate ligand and en is bidentate. The number of ...
Consider, for example, the formation of the complex [MgCl] + in solutions of MgCl 2. The formation constant K of the complex is about 1 but varies with ionic strength. [80] The concentration of the rather weak complex increases from about 0.1% for a 10mM solution to about 70% for a 1M solution (1M = 1 mol dm −3).
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 ...
There are two non-linear simultaneous equations in two unknown quantities [A 3−] and [H +]. Many computer programs are available to do this calculation. The speciation diagram for citric acid was produced with the program HySS. [11] N.B. The numbering of cumulative, overall constants is the reverse of the numbering of the stepwise ...
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In chemistry, charge-transfer (CT) complex, or electron donor-acceptor complex, describes a type of supramolecular assembly of two or more molecules or ions. The assembly consists of two molecules that self-attract through electrostatic forces, i.e., one has at least partial negative charge and the partner has partial positive charge, referred ...
Police in New Mexico said a 16-year-old teen killed four members of his family including his mom, dad and siblings over the weekend.