postlab 5 .docx - Introduction In this experiment sodium...

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Introduction In this experiment, sodium thiosulfate is used to titrate a known concentration of potassium iodate solution. Stoichiometric analysis can be used to determine the concentration of potassium iodate solution. Sodium thiosulfate is an inorganic sodium salt. It is composed of two to one ratio of Sodium and Thiosulfate ions. Interesting enough, sodium thiosulfate serves many purposes outside of the analytical chemistry lab. For example, if an individual was experiencing cyanide poisoning, then sodium thiosulfate would play the role as the antidote. It will actually counteract the poison and reverse the effects. Another use for sodium thiosulfate is for use as an antifungal drug. It’s a chemical that serves many useful purposes. Another crucial procedure being carried out in this experiment is titration. Titration is a process we use in the lab to help determine unknown concentrations. This is not a rushed process and all measurements need to be taken carefully. It is important to record all data and take notes throughout the experiment to help with stoichiometric analysis in determining the unknown concentration. The easiest way to reduce error in this type of experiment is by strict preparation of the samples. It is extremely critical to only prepare each sample when you are getting ready to titrate that specific sample. Do not leave time in between preparing the sample and titrating it. When you prepare each sample immediately before you titrate it you are reducing the risk of contamination at a very high percentage. If a sample becomes contaminated, the color changes you are looking for might not appear or the results will not be accurate.

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