Laboratory Inquiry for Determining the Chemical Composition of a Component in a Laboratory Detergent

Students determine the concentration of sodium sesquicarbonate in an alkaline laundry detergent though a combination of an acid-base titration and thermal gravimetry, both of the thermal decomposition and the decomposition by reaction with acid.

The full citation is here: Koga, N., Kimura, T., Shigedomi, K.  J. Chem. Educ. 2011, 88, 1309–1313 and a link to the article is provided below (subscription to the journal required).