Anions Lab

Purpose: The purpose of this lab is to identify the presence of cations and anions in four unknown solutions by identifying whether they are copper, silver, iron, or chloride ions which is done by adding sodium hydroxide, solid copper, silver nitrate, and potassium thiocyanate to the solutions and analyzing the chemical reactions.

Introduction: Chemical change, unlike physical change is the change in the composition of a substance rather than simply its shape, size, or state (Marie, 2015). Signs that a chemical change has taken place can include a change in state that is not a result of temperature change, for example the forming of precipitates, a change in colour, smell, or taste, the formation of bubbles, and if heat or light is produced
Medical results can be categorized into two major categories, results that give direct yes or no answers and results that give relative results (Torrey, 2016). When an individual is talking about “testing positive” for something they are referring to the results of tests that give yes or no answers (Torrey, 2016). These tests are usually diagnostic tests, and are used to show whether a certain disease or condition is present in your body by giving a “positive” or “negative” result (Torrey, 2016). If the test result is positive, it means that the subject that the test was looking for was found in your body, and if negative, then the test subject was not found in your body (Torrey, 2016). A common misconception is that positive and negative refer to whether the result is good or bad, but that is not always necessarily the case (Torrey, 2016). For example, if the test was used to find tumours in a certain part of your body, and the test result showed “positive”, that means that the tumour(s) was/were in fact found in your body, and in that specific case, the result of the test is “positive” although the patient may consider it a negative or bad result (Torrey, 2016). Likewise, if the test was used to look for STIs in your body, and the test result comes back “negative”, it will probably be considered to be a good or positive result to the client even though the test result itself said “negative” (Torrey, 2016). Career choices in which this knowledge would be useful in are doctors because they need to know the terms in order to explain the results to the patients and ultrasound/x-ray/CT/MRI technicians as well as chemists who analyze the samples (of solutions such as blood or urine) collected from patients because they need to know the terms in order to be able to write the test results which are then sent to doctors, who then inform the