Which was 117.60 grams for substance 1, 87.71 grams for substance 2, 54.7 grams for substance 3, 25.11 grams for substance 4. Once we finished weighing each unknown substance we started figuring out the g/mol mass of each compound that the substances could possibly be, which is how we got to Table #2 above. In order to find the g/mol mass of each of the compounds, we had to find the molar mass of each element, then multiply and add accordingly. I'll use K2SO4 as an example of how to calculate the molar mass of a compound. The elements in K2SO4 are Potassium, Sulfur, and Oxygen.
To calculate the experimental mass the substance of each bag and the bag its self was measured using a balance. After gathering the mass subtract the mass of the empty bag to the mass of the unknown substance, in order to just have the mass of the substance. Afterward the mass of the unknown substance was divided by the number of moles recorded on the bag of the substance. The measurements are displayed on the table
The purpose of this lab was to be able to use physical characteristics to determine the identity of an unknown compound. The data from this experiment classified aluminum as metallic; ascorbic acid, paraffin, palmitic acid, sucrose, graphite, and water as molecular; sodium chloride as ionic. In order to determine this, 3 tests were conducted. The first test was to test the conductivity of each substance at room temperature. In this test, only graphite and aluminum conducted.
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%.
The Controlled Variable for this experiment was mass and volume. When identifying an unidentified object finding the density is the easiest way to do it because, any pure substance has a specific density at a specific temperature and each element and compound has a unique density associated
Abstract: An unknown solution (unknown number 40) was used to identify the presence of different cations in the solution. The separation method was used to identify ions present in the unknown solution. The unknown number 40 solution contains 2 different cations from different group, Hg^(2+) from the silver group and Bi^(3+) from the cupper group. Another experiment was performed with, unknown solution number 2, which helps to identify the presence of the Barium-Magnesium Group. A flame test was performed to identify if the cations that was present to the solution.
Using the Law of Definite Proportions, the mass of this product was used to determine the number of moles of copper and chlorine in the sample, which led to being able to determine the
.1-amEr (c) Gram molecular mass of HNO3 = Mass of 1-molecule of HNO3x NA = 63 amu x NA = 63 gm X NA = 63 gram NA Solved Example-4:Find out the mass of carbon -12 that would contain 1.0 x1019carbon-12 atoms. Solution : Mass of 6.022 x1023 carbon-12 atoms = 12 g Mass of 1.0 x1019 carbon-12 atoms = 12x1x10 19 g 6.022 x1023 = 1.99 x10-4g Solved Example-5: How many molecules are present in 100 g sample of NH3?
This method, not only allows to calculate the average, but also assures that the data is close to the actual value. After these sets of procedures were conducted, the unknown metal sample was identified. The unknown substance had an average density of 7.64 g/ml, which was close to the density of Tin with 7.3 g/ml as its density. The possible explanation for the differences in their values can be due to experimental errors. One of the main experimental errors that contribute to this would be, that the pennies might not be completely
Purpose The purpose of this experiment is to find information and explore similarities about eight compounds- NaCl (Salt), Sugar, Paraffin Wax, Acetylsalicylic Acid (Aspirin), Calcium Chloride (deicer), Ascorbic Acid, Cornstarch, Epsom Salt, all through six tests- physical appearance, hardness, conductivity as a solid, solubility in water, conductivity as a liquid or solution, and melting point. Hypotheses If we test physical appearance then all compounds will be white and somewhat transparent. Sugar and salt will be composed of small grains.
Introduction: As a class, we were each given our own individual compounds. The goal to figure out, through a series of tests, what the compound was. The reason we did this was to understand that the properties and behaviors of a compound are all we need to correctly identify them, and not just knowing the name of them. The experiments that I used were, the solubility test, the conductivity test, and the flame test.
The items that were massed were the evaporating dish, watch glass, and NaCO3. The materials were massed once before and once after being heated in the drying oven. The mass of the evaporating Dish before was 46.57 g; while after being heating was 60.15 g. The mass of the watch glass before was 57.97 g and after was 48.75g. There were two masses taken for the substance NaHCO3- one with the evaporating dish and one without, subtracted out after the lab was concluded. The mass of the substance with the dish was 48.79 g before and 62.33 g after; meanwhile, the mass of the substance without the dish was 2.22 g before and 2.18 g after. The mass of the NaHCO3 had changed after the reaction occurred along with after it was placed on the hot plate and being in the drying oven.
The experiment for this report is 5, 6, and 7. In experiment 5 there are given a Sodium Hydroxide which is 4.126 g when it is weighted and a KHP also with the NaOH there’s two other experiment that are used to find the titration of molarity in the three chemical balances. In exp. 6 and 7 there using the NaOH to find titration in an acid and vinegar by going through three trails to see how much sodium hydroxide is pick in it until it turns light pink, however if it turns dark pink there’s an error in the trail.
The purpose of this experiment was to determine whether two liquids were the same. The purpose was also to determine whether the liquids can be told apart by how they look and to figure out how to definitively tell them apart. The individual results were that Liquid I had a density of 1.3g/cm³ and Liquid II had a density of 1g/cm³. The class results in numbers were deemed inconclusive, but the graph shows that these liquids are two different substances due to their different densities. Despite their different densities, it was deemed after class discussion that the liquids were the same substance.
I. Purpose: To experimentally determine the mass and the mole content of a measured sample. II. Materials: The materials used in this experiment a 50-mL beaker, 12 samples, a balance and paper towels. III.
