Abstract: The purpose of this experiment was to identify given Unknown White Compound by conducting various test and learning how to use lab techniques. Tests that are used during this experiment were a flame test, ion test, pH test, and conductivity test. The results drawn from these tests confirmed the identity of the Unknown White Compound to be sodium acetate (NaC2H3O2) because there were no presence of ions and sodium has a strong persistent orange color. The compound then will be synthesized with the compounds Na2CO3 and HC2H3O2 to find percent yield.
Determining the Identity of an Unknown White Compound Maxwell Yurs Group Member: E.B. Floersch, Alexander Medina, and Masih Horri College Science and Engineering University of Minnesota, Minneapolis October 12, 2014 The experiments that were completed were used to determine the identity of an unknown white compound to allow for proper disposal. These experiments included flame tests, pH tests, and conductivity tests. After each was completed, it was found that the identity of the white compound was Sodium Nitrate.
Purpose: The purpose of this lab is to titrate an unknown solid acid (KH2PO4) with a standardized sodium hydroxide solution. After recording and plotting the data, the acid’s equivalence point will be recorded once the color changes. Using the equivalence point, the halfway point will be calculated, which is used to determine the acid’s equilibrium constant. The acid’s calculated equilibrium constant will be compared with the acid’s established pKa value.
The investigation was carried out to identify the presence or absence of biological molecules in serum 2216. If the concentration in each test tube of the dilutions carried out will be more concentrated then the concentration of the test tube before it, then the color will be at an equal concentration with the other dilutions performed. The hypothesis was wrong because of the difference in concentrations due to the different measurements within the dilutions done. The test for starch was to add a drop of iodine solution to the pipette in the spotting tile. A reducing sugar solutions is add inside a test tube with 3 drops to then add 3 drops of benedicts and plane in a water bath.
Dow's Unknown Substance Mystery 4 unknown substances have been stolen from Dow Inc. The substances are in plastic bags that we cannot open. We were given the task of figuring out what substances were stolen using the electronic balance, the compounds that were provided, and an empty plastic bag. We had to use those items because the Gas Chromatography-Mass Spectrometry was broken and a technician could not come out until next week. Consequently, using the resources provided, we determined that Substance 1 is NaCl, Substance 2 is K2SO4, Substance 3 is Na2CO3, and Substance 4 is NaC2H3O2.
The experimental molar mass was calculated to be 87.5005 grams. Some source of error could be that there was not enough time to let the solution warm up to room temperature, letting the solid formed in the 11 dram dial to melt, causing the temperature probe to possibly read incorrectly. Also, while using a plastic pipet, the drops added were not consistent and varied in size. This could have led to different masses between the first and second set of 20 glycerol drops used in trial 2 and 3 of the experiment. These mistakes and errors can account for the percent error of 4.98%.
On April 6, 2016 at approximately 11:45am, a local police station got a call about a hostage situation at a local pharmacy. When police and medical examiners got to each crime scene, they learned that all of the hostages were given drugs and had overdosed on them. Some of the pills, in powder form, were found near the victims. One of the victims was stable enough to tell the investigators that the power on the floor were the drugs they were forced to take. The medical examiner found out each hostage was given either unknown A or unknown B.
The percent recovery of the acid was 42%, but there was originally 40% of o-toluic acid in the mixture. The extra 2% could have been the impurity, 1, 4-dibromobenzene, which was isolated in the next part of the experiment. There is also another possible reason on why more acid was recovered. The acid wasn’t dried completely before it was weighed; the clumpy solids of the acid prove that it was still wet and thus, the extra liquid added to its mass. This could have been prevented by allowing the acid to dry longer or by drying it in an oven.
Exercise 14: Unknown Identification Lab Report The purpose of the study was to identify the unknown bacterium using various biochemical tests in addition to using scientific methods in determining the outcome of the hypothesis. Each biochemical test will help determine the bacteria based on specific characteristics of each organism. I was giving unknown number 232. The first procedure that needed to be done after obtaining unknown bacterial mixture was to isolate the two bacteria in a pure culture using the streak plate method described in Microbiology Laboratory Manual Eight Edition. The material used was trypticase soy agar (TSA) plate, nutrient plate, starch agar, hydrogen peroxide, iodine reagent and microscope.
Unknown Lab Report Unknown # 25 By: Jenna Riordan March 19, 2018 Bio 2843 1. Introduction Microbiology is the study of microorganisms found in all different environments throughout Earth, from the hot thermal vents at the bottom of the ocean to the ice at the top of a mountain.
The melting points of the purified acid, base, and neutral precipitates were taken to compare the melting points found in the experiment to the standard melting points of the potential acid, base, and neutral compounds that could have been used. Based on this melting point comparison, it was concluded that the unknown acid was benzoic acid, the unknown base was 3-nitroaniline, and the unknown neutral compound was most likely
When Unknown Substance D was observed on the hot plate, it turned a brownish color and into a sticky liquid at two minutes just like the known covalent compounds, proving Unknown D had a low melting point. Ionic compounds cannot melt because they are made up of atoms with full opposite charges, so their intermolecular forces are stronger. While ionic compounds do not melt, covalent compounds do because their atoms only have slight charges, so their intermolecular forces are weaker. Since ionic compounds have stronger intermolecular forces, it takes more energy to pull the molecules apart. Opposite of ionic compounds, covalent compounds have weaker intermolecular forces, so it takes less heat to pull the molecules apart, which makes covalent
Lab Number One Michael DeMart Lynn University Lab Number One Humanity is the master of innovation with millions of people living in superb living conditions around the world today. But as we examine the past it is evident that millions of people lived in harsh conditions especially those who lived by the arctic circle, for example, the Sami people who live in northern Sweden. A question that arises is how did these people construct their huts to keep warm in the winter months where the outside temperature gets cold as -30 degrees Celsius. So why did these scientists decide to conduct this study?
Introduction: Microbiology is the study of the microbial world, which is composed of microorganisms that are too tiny to be seen with a naked eye. This project demonstrates the significance of correctly identifying unknown organisms with methods and techniques acquired in the laboratory as they can make or break one's ability to accurately isolate and identify various species. Studying microbes enables oneself to have an insight on not just their structure or how they function, but how they have an impact on organisms and their environment around them as they can be found nearly anywhere. The importance of the process of identifying unknown bacteria vary from determining the causative agent of a disease, to testing if a specific food or fluid is safe to consume, and simply knowing what is present
The same amount of food was replaced (0.75 grams), and the experiment was repeated again for a
