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Chapter 2 Analyses of the substance that forms bubble

2.1　Preparation of the specimen for analyses
2.1.a　Materials used for analyses
　Photographs of materials used for analyses are shown in Fig.7. As for the impurity of iron, calcium (Ca) and also silicon (Si) were included in the surface to steel wool.

　　 　　　
　(a) steel wool 　　　　　　(b) glass container　　　 (c) materials for specimen
Fig.7　Glass container, steel wool and materials for specimen The maker of steel wool reports that calcium atoms and silicon atoms adhered to the surface of steel wool through manufacturing process.

2.1.b　Preparations for analyses　
　　Changes of the carbonated water with steel wool is shown in Fig.8. Comparing with the results of iron powder, the color of the solution is brown. It is considered that the differences caused by the effects of calcium (Ca) and silicon (Si).
　
　　　　　　
(a) after 13minutes(凹：due to container)　(b) after 15hours6minutes

　　　　　　
(c) after 21hours3minites　　　　　　　　　　(d) after 26hours38minutes
Fig.8　Changes of carbonated water after steel wool was input


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