Iodine

surfaces. Some are destructive preventing testing the object for other forensic evidence while others are non-destructive. In order to make prints visible on porous surfaces, forensic scientists use one of three methods; Silver Nitrate, Ninhydrin and Iodine fuming. These three methods are known to be the most effective ways for developing prints. Silver Nitrate is best known for developing prints on porous surfaces. Specimen on these surfaces can either be sprayed by or immersed in a diluted…

using iodine as an indicator.…

As the iodine molecules left the water, the solution started lightening up because it was getting closer to being pure water and the starch molecules were too large to diffuse out of the dialysis bag to alter the water and iodine solution outside of the bag. The glucose however, did manage to diffuse out of the bag and because it was clear, it had no impact on the colour of the iodine and water solution. When we weighed the dialysis bag we found…

The article Women who drink organic milk in pregnancy could harm their baby’s IQ is regarding women who drink organic milk during pregnancy and the effects of the organic milk on their babies’ intelligence later in life (around the ages of nine and ten.) Studies have shown that women who drink organic milk have a sixty percent higher risk of lowering their child’s scores on test, this will also continue throughout a child’s education, even into the adulthood of the child. The title of Organic…

properties of Unknown #1103, four tests will be performed. Benedict’s test, an iodine test, a biuret test, and a test of Sudan III will all help determine that which is Unknown #1103. Benedict’s test is performed to determine whether Unknown #1103 has reducing sugars by testing for a reaction with Benedict’s reagent. The test is positive if the mixture turns yellow or red, but it is negative if it turns blue or green. The Iodine test is performed in order to determine the presence of starch in…

Antiseptics are used to treat and prevent infection on skin, but many antiseptic products use different active ingredients to kill or slow the growth of bacteria. Several commonly used antiseptics contain active ingredients include isopropyl alcohol, iodine, chlorohexidine gluconate, and hydrogen peroxide. The use for products with these ingredients also depends on the type of wound since certain active ingredients have different mechanisms for killing bacteria. However, a growing concern in…

IV. METHODOLOGY SAPONIFICATION VALUE Saponification is a method used in treating a neutral fat with alkali, breaking it down to glycerol and fatty acids. The saponification value or saponification number is the amount of alkali needed to saponify the given quantity of fat or oil, expressed as mg potassium hydroxide to saponify 1 g of the sample. In this experiment, the researchers used chemicals such as ethanol, hydrochloric acid (HCl), potassium hydroxide (KOH) and phenolphthalein indicator.…

Title: Alexandra Whitaker, Ms.Dayton, 12/23/16, 2.03 lab permeability Objective(s): The main purpose is to find out if plastic bags are permeable to starch and, or, iodine. Also, to find out wither potatoes are hypotonic, hypertonic, or isotonic by testing the different amounts of sucrose solutions Introduction: The necessary background information needed for this lab is the definition of osmosis, diffusion, active transports, passive transports, permeability, concentration, tonicity, and to…

Part A Results We hypothesized that the iodine will diffuse into the bag, turning the inside a darkish blue/black color. We also hypothesized that glucose will diffuse out of the bag, forming a green color (after the Benedict’s test). This experiment was set up using a dialysis tubing bag, balloon clips, beaker, iodine, solution of 1% soluble starch and 15% glucose. The dialysis tubing bag was filled up with starch and glucose, leaving a pocket of air for diffusion of materials, and sealed…

Using a spot plate, 250 μL, or 5 drops, of the samples from the test tubes were each placed in individual wells. 50 μL or 1 drop of the iodine reagent was added into each of the individual wells containing the samples. There should have been a color change depending if hydrolysis had occurred. One other test involved with hydrolysis is the Benedict’s Test. In each test tube, 2 mL of Benedict’s…