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30 Ιουν 2023 · The reaction between persulfate ions (peroxodisulfate ions), S 2 O 8 2-, and iodide ions in solution can be catalyzed using either iron(II) or iron(III) ions. The overall equation for the reaction is: \[ S_2O_8^{2-} + 2I^- \rightarrow 2SO_4^{2-}+ I_2 \label{2} \] For the sake of argument, we'll take the catalyst to be iron(II) ions.
In the empty lattice given below, draw in the Mg and O ions. Show the electron configurations for the magnesium ion and the iron ion. Explain why the structure containing the Mg cations is non-magnetic while the structure containing the Fe cations is magnetic.
Write the chemical formula for a simple ionic compound. Recognize polyatomic ions in chemical formulas. We have already encountered some chemical formulas for simple ionic compounds. A chemical formula is a concise list of the elements in a compound and the ratios of these elements.
The formula of an ionic compound represents the simplest ratio of the numbers of ions necessary to give identical numbers of positive and negative charges. For example, the formula for aluminum oxide, Al 2 O 3 , indicates that this ionic compound contains two aluminum cations, Al 3+ , for every three oxide anions, O 2− [thus, (2 × × +3 ...
The formula of an ionic compound can be determined by directly comparing the charges of the ions: For example, iron (II) sulfate. The iron (II) ion is Fe 2+, which means that it has a 2+ or +2 charge. The sulfate ion is SO 42–, which means that it has a 2– or –2 charge. The charges cancel each other out.
The molecular geometry, or three-dimensional shape of a molecule or polyatomic ion, can be determined using valence-shell electron-pair repulsion (abbreviated VSEPR and pronounced “VES-per”) theory, in which the basic principle is valence electrons around a central atom stay as far apart as possible to minimize the repulsions.
These correspond to ion charges from 1 to 7 , as shown in Table 3.5. Here are some examples: • Fe3 or iron(III) is pronounced “iron three” and means the iron ion has an ion charge of 3+. • Fe2 or iron(II) is pronounced “iron two” and means the iron ion has an ion charge of 2+.
