When calcium chloride reacts with iron(III) chloride and potassium thiocyanate, a double displacement reaction occurs. The calcium and potassium ions switch places, resulting in the formation of calcium thiocyanate and iron(III) chloride. The iron(III) chloride then reacts with the excess potassium thiocyanate to form iron thiocyanate, a deep red complex compound. Therefore, the overall reaction results in the formation of calcium thiocyanate and iron thiocyanate. **

Iron(III) ions are positively charged ions of iron with a charge of +3. They are commonly found in compounds such as iron(III) chloride or iron(III) sulfate. Thiocyanate ions, on the other hand, are negatively charged ions composed of one carbon atom, one nitrogen atom, and one sulfur atom. They are commonly found in compounds such as potassium thiocyanate or ammonium thiocyanate. **

Silver chloride is sparingly soluble in water, with a solubility of approximately 0.002 g/L at room temperature. On the other hand, silver thiocyanate is even less soluble in water, with a solubility of about 0.0002 g/L at room temperature. This means that both compounds have low solubility in water, making them relatively insoluble. **

The detection of cobalt with thiocyanate can be carried out by adding a solution of thiocyanate to the sample containing cobalt ions. The formation of a blood-red complex between cobalt and thiocyanate can be observed, indicating the presence of cobalt. This complex can be further confirmed by measuring the absorbance of the solution at a specific wavelength using a spectrophotometer. The intensity of the absorbance is directly proportional to the concentration of cobalt in the sample, allowing for quantitative analysis. **

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