The observation shown in the image is qualitative.
Chemical analysis could be;
In a qualitative chemical analysis, we seek to determine the components of a substance. In a quantitative analysis, we seek to determine the amount of each of the components of a substance. Both types of analysis are of utmost importance in chemistry.
From the image, we can observe a color change. qualitative analysis may be carried out by use of chemical reagents which can give positive tests such as color change to show the presence or absence of certain constituents of a substance.
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