Nitrate test to 2.5 micrograms and a concentration of 1 in 25,000 parts. Devarda's alloy (Copper/Aluminium/Zinc) is a reducing agent. When reacted with nitrate in sodium hydroxide solution, ammonia is liberated. The ammonia formed may be detected by its characteristic odor, and by damp red litmus paper's turning blue, signalling that it is an alkali — very few gases other than ammonia evolved from wet chemistry are alkaline. Aluminium is the reducing agent in this reaction that will occur. Diphenylamine may be used as a wet chemical test for the presence of the nitrate ion. In this test, a solution of diphenylamine
SAT Subject Test in Chemistry laboratory concepts can simply be memorized beforehand. Some lab-based questions use diagrams, and thus it is helpful to know what common glassware looks like and how the different pieces are used. Like most of the SAT Subject Tests, the Chemistry SAT Test is relatively difficult. It tests a very wide breadth of content and expects students to formulate answers in a very short period of time. Many high school students find themselves picking up extra resource material, like prep books and online aids, to help them prepare for the SAT Chemistry test. While the test is challenging, there are distinctions