1 This should remove most of the water soluble species (that is the acids and the alcohol).  Add 5 mL sodium carbonate solution to neutralise acid still present. Swirl the flask until the production of carbon dioxide gas is no longer vigorous. Repeat this process until no more carbon dioxide gas is produced.
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1 Test preparation courses for aircraft maintenance certification exams cost $150-$2,500. 2  Washington's Everett Community College offers test prep courses for $150-$500, while the Aviation School of Excellence in Valdosta, GA has courses for $600-$2,450. Portland Community College in Oregon charges $8,500 for tuition and fees for the two-year program, while Columbus State Community College charges $14,000 for Ohio residents and $31,000 for non-residents. 2  Graduates of this program typically apply for an entry-level job as a certified aviation maintenance technician.