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Teaching chemistry employing a problem-solving approach is widely used and studies recommend it for different teaching levels since it allows students to develop concepts, procedures (know how to do), and attitudes (know how to be). From this standpoint and considering the importance of sugar cane, this study proposes a problem linked to an experimental activity classified as small research. The activities make it possible to explore chemical concepts from the reactions obtained in the analysis of iron (III) ions in a sample of “unrefined brown sugar. Iron (III) ions can be identified in solution, due to the emergence of a specific color, in the presence of adequate reagents. The experiment allows exploration of contents linked to chemical transformation and related to environmental and social approaches, involving an agricultural culture historically connected to Brazil, particularly the North-Northeast region

INVESTIGATION OF THE (III) IRON ION IN A CONCENTRATED SUGAR SAMPLE: PROPOSAL OF A TEACHING APPROACH FOR SOLVING PROBLEMS