Dietary minerals

89 68th and Zinc A key aspect of chemistry once a reaction is completed, is analysis. So far you have quantitatively analyzed your white colored compound from the reactant side based on your knowledge of how much iodine and zinc reacted. Now you will determine the amount of zinc from the product side. To do this you will perform a titration which is basically a reaction between a known quantified substance, Na2H2EDTA, and an unquantified substance in this case, the amount of zinc ion in your product, zinc iodide. Once you have mastered the technique of titration, you will be given an unknown zinc salt and asked to find out how much zinc ion is in this substance. By doing this activity you will see how one quantity can be logically deduced

15 Southside Seaweed Seaport Chemists are often depicted in movies or in books as eccentric and absent-minded p:ofessors. ln reality chemists are very in touch with the needs of society and are more practical tnan you nay think. Chemists often isolate substances found in nature or create new substances that benefil our heai:h. This activity is a case in point. You will be isolating an iodide salt that will be used to prepare a tinctlrre of lodine. Sold as an over-the-counter drug in your local pharmacy, iqQlne is used as an antiseptic on cL(s and scrapes of the skin. lodine has also been used to sanitize swimming pools and medical instruments pur,fy drinking water and is used in the treatment of goiter (swelling of the thyroid). I hope that this acti\.i}, r,rill convince many of