Seawater Composition and Salinity :: Tides and Salinity

Using the decanted supernatant solution from the precipitation experiment, a outfit loop was dipped into the solution. This loop was stuck in the fervidness from a bunsen Burner and heated until a flame appeared. The presence of a bright white-livered flame confirmed that Na+ was in attendance. Using a atomic number 27 glass as a filter, the loop was examined and a violet flame was present, showing that K+ was also in the supernatant solution. tryouting for NH +This running was carried out employ the original solution to avoid contamination of ammonium ion salts from the other procedures. 0.1M NH4CL and DI water were added to a large well on the micro drop tray before drops of 6M NaOH were added. A piece of red litmus constitution was put on top of the well and covered with a check out glass. The appearance of an unmarked blue color, a direct result of the bother of NH3 gas, on the paper confirmed the existence of NH4+. The experiment was repeated using seawater instead o f the 0.1MNH4CL and DI water combination.QuantitativePre-Gravimetric Set UpTest tubes were obtained and labeled using a bl according to which psychometric test the sample was think for Barium) and what depth the sample was obtained at or bottom).All the test tubes were put in a beaker andan oven at 110C for half an hour to dry. erstwhile dry th removed and allowed to cool on a test tube base, as Figure 1 Test tube rack with test tubes Figure 1, before universe weighed and their weights rec money Halides Gravimetric abbreviationThe tests tubes labeled Halides Top and Halides Bottom were taken and 1mL of seawater was added to each. The test tubes were so weighed and their new weights recorded, before 6M Nitric Acid (HNO3) was added to each to acidify it. 0.1M Silver Nitrate (AgNO3) was introduced, causing a white precipitate to form. The solution was emotional with a glass rod and centrifuges for approximately a quarter of an hour. once complete,another series of drops of 0. 1M AgNO3 were added to ensure complete precipitation and the solution was recentrifuged for some(prenominal) minutes. The supernatant solution was decanted into a wast container and DI water was mixed into the precipitate to slap-up it. The solution was centrifuged, supernatant decanted, and rinsed with DI water once more before being centrifuged and the aqueous solution decanted for a final time. The test tubes were then returned to the beaker and laid back into the oven to dry for a week.