A student makes a Koolaid solution by diluting 61.2 mg of Koolaid with water to a total volume of 25.00 ml using a volumetric flask. She reads the absorbance at 500 nm and finds it is too concentrated. The student then dilutes a small sample of the Koolaid solution by taking 0.500 ml of the solution and mixing it with 0.500 ml of water (a ½ dilution). The absorbance of the ½ diluted solution is 0.812.

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .