Chemistry Unknown Lab Report
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.
The compounds tested in included the unknown, Calcium Nitrate, Calcium Chloride, Calcium Carbonate, Sodium Chloride, Potassium Chloride, Magnesium Chloride, and Ammonium Chloride. The next test was the pH test. In this test, the aqueous solutions from the flame tests were used again. A piece of pH paper was dipped into the aqueous solutions, a different piece for each solution. The ensuing coloration of the paper was compared to the pH scale and the
Claim: Through the tests performed in lab, it was concluded that unknown powder E was NaHCO₃, powder K was MgSO₄ and powder V was cornstarch. Evidence: Unknown element E was first tested with phenolphthalein and the solution turned pink, this test left 3 possible compounds; NaHCO₃, Na₂CO₃, and CaCO₃. Next the compound was tested with iodine and the solution turned yellow showing that now there was two compounds that could be the identity of unknown powder E; NaHCO₃ and CaCO₃. After that compound E was tested for being soluble in water, the powder was soluble, this proved that unknown element E is NaHCO₃. Unknown Element K was also first tested following the steps for the phenolphthalein test and the compound turned clear, this test ruled out NaHCO₃, Na₂CO₃, and CaCO₃. Second the unknown powder was tested with iodine and the solution turned yellow, leaving NaCl, CaSO₄ and MgSO₄ as possible identities of unknown powder K. Considering this it was next tested for solubility in H₂O, and it was concluded that the compound was soluble. Next the unknown element was tested with sodium hydroxide and a white precipitate formed proving that unknown powder K was MgSO₄ because NaCl and CaSO₄ were ruled out.
Exercise 1 1. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results from Data Table 1 as a guide, how would you test this material for the presence of sodium bicarbonate? B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript33 Words
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.
Identification of bacteria within Unknown Culture #21 In this experiment, an unknown culture of two different types of bacteria was assigned to each person, a number of tests were performed to isolate and identify these bacterial cells. Based on knowledge from the previous experiments completed in lab, a basic understanding of each type of bacteria was used to create a flow chart that would aid the process of identifying the unknown bacteria within the culture. A gram stain that is performed initially will narrow down the types of tests certain bacteria will and will not respond to. In addition to the gram stain, some of the tests that were used include, a catalase test, an Eosin methylene blue (EMB) agar test, a bile esculin test, and a 6.5% sodium chloride (NaCl) test.
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
The purpose of this lab is to identify the seven numbered solutions through chemical reactions. It was done by mixing the numbered solutions of known names but unknown number of distribution with each other and analyzing the chemical reactions. Research shows that NiCl2 is the green liquid. NiCl2 will not react with anything except with AgNO3 and Na2CO3, so the first step will be mixing all solutions with NiCl2 until those two chemicals are found. Na2CO3 will create bubbles (CO2) while AgNO3 does not when mixed with the other chemicals.
The Cysteine desulfurase test implies that the bacteria can hydrolyze cysteine to produce hydrogen sulfide. Lastly, the Citrate utilizing enzymes test came back positive which indicates that the bacteria has the ability to use citrate as a sole carbon energy source for growth and to produce alkaline
To check the conductivity of the solid it was put in a small dish and was tested with the conductive meter. Then t o check solubility of the unknown solid it was mixed into a small amount of water to see test solubility. The next text was to conduct a ph test using some aqueous solution of the unknow solid we applied that to a ph paper strip to show ph. Another test was checking the solid’s reactivity. Using water mixed with
The task the town council requested was to determine which of the three materials limestone, granite, or red sandstone was better for statues at the local zoo. To establish the most useful material, test how much the pH of the vinegar changed after the rock reacted. The stone which will be the most effective is the one which reacted with the acid rain the least. The greater the pH change the higher the reaction was. Consequently the material with the lowest pH difference would be the most reliable.
A chemical change has occurred when a new substance has been formed and the original substance(s) cannot be changed back to it’s/ their original state. The chemical bond formed could possibly be broken, but it could be extremely hard. Also, in a chemical reaction, usually a drastic change occurs, almost immediately. This is how you can tell if a chemical change has occurred.
Calorimetry 1 The purpose of this experiment is to identify the mystery metal given to us (metal A). We are going to identify the mystery metal by looking at both its physical properties as well as its heat capacity. The heat capacity of the metal will be calculated using a setup/method described below. We will also look at the physical properties of the metal such as its magnetic properties, density, whether it is lustrous or dull, etc.
In this experiment we observed the different effects produced when an acid or a base is added to an unbuffered system (water) and to a buffered system. After seeing that when the acid was added to the unbuffered solution, we found that the color changed from a purple to a pink. My team and I estimated the pH to be a 3. When the base was added to the unbuffered solution the color changed from a purple to a green color. We determined the pH to be 13.
The first variable, in the experiment, is the acid. The acid is the type
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