The diagram summarises some reactions of copper compounds.
Identify, by name (including the oxidation state) or formula, the species in the sequence that contain copper.
P ......................................................
Q ......................................................
R ......................................................
S ......................................................
T ......................................................
V ......................................................
W ......................................................
T and V are the same type of chemical species.
The reaction between copper(I) iodide and sulfuric acid is a disproportionation.
The rare mineral mitscherlichite has the chemical formula K2CuCl4⦁nH2O.
4.26 g of mitscherlichite was dissolved in distilled water and the solution made up to 250.0 cm3. Excess potassium iodide solution was added to a 25.0 cm3 portion of this solution and the iodine formed was titrated against a solution of sodium thiosulfate with a concentration of 0.0500 mol dm−3.
This procedure was repeated until concordant results were obtained.
The mean accurate titre was 26.65 cm3.
The equations for the reactions are
Calculate the value of n, the number of moles of water of crystallisation per mole of mitscherlichite.
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