Preview

Composition of Potassium Chlorate

Good Essays
Open Document
Open Document
1531 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Composition of Potassium Chlorate
EXPERIMENT 9 Composition Potassium of Chlorate

IUA-,TERIAL S AND E QUI PME NT Solids: Reagent Grade potassium chlorate (KC1O3)and potassium chloride (KCl). Solutions: dilute (6 M) nitric acid (HNO3) and 0.1M silvernitrate (AgNO3). Th.o No.0 crucibles with covers; Ceramfab pad. DISCUSSION The percentage composition of a compound is the percentage by mass of each element in the compound. If the formula of a compound is known, the percentage composition can be calculated from the molar mass and the total mass of each element in the compound. The molar mass of a compound is determined by adding up the atomic masses of all the atoms making up the formula. The total mass of an element in a compound is determined by multiplying the atomic mass of that element by the number of atoms of that element in the formula. The percentage of each element is then calculated by dividing its total mass in the compound by the molar mass of the compound and multiplying by 100. The percentage composition of many compounds may be directly determined or verified by experimental methods. In this experiment the percentage composition of potassium chlorate will be determined both experimentally and from the formula. When potassium chlorate is heated to high temperatures (above 400'C) it decomposes poto tassium chloride and elemental oxygen, according to the following equation: 2 KCIOB(s) -----+ 2 KCI(s) + 3 Ork) The relative amounts of oxygen and potassium chloride are measured by heating a weighed sample of potassium chlorate and determining the amount of residue (potassium chloride) remaining. The decrease in mass brought about by heating represents the amount of oxygen originally present in the sample. From the experiment we obtain the following three values: 1. Mass of original sample (KCIO3). 2. Mass lost when sample was heated (Oxygen). 3. Mass of residue (KCI). From these experimental values (and a table of atomic masses) we can calculate the following: 4. Percentage oxygen in sample
Continue Reading
View Writing Issues

You May Also Find These Documents Helpful

  • Good Essays

    Investigating Stoichiometry with Carbonic Acid Salts
    • 420 Words
    • 2 Pages

    Investigating Stoichiometry with Carbonic Acid Salts

    In table 1.1, the mixture of HCl and unknown sample 1 were combined. It took about 19.5mL of HCl to turn the solution yellow, after heating and evaporating the water from the solution, the glassware with the NaCl weighed 92.84g. When the glassware was weighed again after the NaCl was washed out, it was 92.69g. There was 0.15g of NaCl that had formed.…

    • 420 Words
    • 2 Pages
    Good Essays
    Read More
  • Good Essays

    Chem 1212k Lab Report
    • 1333 Words
    • 6 Pages

    Chem 1212k Lab Report

    In this Chemistry Lab the main objective is to perform accurate chemical analysis for the quantity of elements and compounds in a sample. There will be a compound made then synthesized. The methods used were acid-base titrations, redox titrations, gravity filtration, and distillation. General conclusions included…

    • 1333 Words
    • 6 Pages
    Good Essays
    Read More
  • Better Essays

    Unknown White Compound 643p Lab Report
    • 1844 Words
    • 8 Pages

    Unknown White Compound 643p Lab Report

    The respective volumes of each solution were measured out in graduated cylinders and combined in a large beaker (to increase surface area for evaporation). With added heat to speed up the process, the water dissolved off leaving only the white powdery solid KCl. 0.937 g of substance was the final mass which since the theoretical yield was 1 g gave a 93.7% yield. Some KCl was likely evaporated with the water and some was likely lost in transferring from the beaker to the watch glass, so a 93.7% yield is adequate.…

    • 1844 Words
    • 8 Pages
    Better Essays
    Read More
  • Good Essays

    6.03 Calorimetry Lab
    • 531 Words
    • 3 Pages

    6.03 Calorimetry Lab

    The goal was to use the known molarity value of 0.1017 M 8.9710-4M to determine what the percent KHP was in the unknown mixture. In these trials, the colors did vary a little more than in the first week. Trials 1, 2, and 3 were used to get the most accurate results. The average mass of KHP in the sample was 30.705%, and the standard deviation of the average percent KHP was 0.58259. However, the percent variation in the average percent KHP was 1.8%.…

    • 531 Words
    • 3 Pages
    Good Essays
    Read More
  • Good Essays

    Labpaq Exp 6
    • 730 Words
    • 3 Pages

    Labpaq Exp 6

    Procedure: Filled each test tube with substances provided and subjected them to various conditions. These conditions included, heat, cold water, hot water, acid and basic additions and tested on litmus paper. The reactions were observed and documented at each step.…

    • 730 Words
    • 3 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    10 Unknowns Chem II
    • 888 Words
    • 4 Pages

    10 Unknowns Chem II

    The purpose of this experiment was to be able to apply our knowledge of chemistry to identify 10 unknown elements that were presented to us. We were allowed to use Bunsen burners, hydrochloric acid, use PH paper to test if the unknown solution is an acid or a base, and precipitate each unknown solution with each other.…

    • 888 Words
    • 4 Pages
    Satisfactory Essays
    Read More
  • Powerful Essays

    Chem 103 Project Lab
    • 1372 Words
    • 6 Pages

    Chem 103 Project Lab

    The purpose of this lab is to use a variety of analytical skills and methods to determine the empirical formula of an unknown compound.…

    • 1372 Words
    • 6 Pages
    Powerful Essays
    Read More
  • Good Essays

    Chemical Changes Lab
    • 1727 Words
    • 7 Pages

    Chemical Changes Lab

    In chemistry it is important to understand the difference between physical and chemical changes. The objective of this experiment was to perform tests using heat or chemical mediators and observe the results for any physical or chemical changes. Various materials were heated or mixed, monitored and results recorded. Numerous chemical and physical changes were noted during the procedure. It was possible to distinguish between physical and chemical changes using scientific observations.…

    • 1727 Words
    • 7 Pages
    Good Essays
    Read More
  • Powerful Essays

    Spring Syllabus
    • 2332 Words
    • 10 Pages

    Spring Syllabus

    |College: Science and Technology |Required Text(s): The laboratory manual, Experiments In General Chemistry, 6th |…

    • 2332 Words
    • 10 Pages
    Powerful Essays
    Read More
  • Good Essays

    Determining the limiting reactant and the percent yield i a precipitation reaction
    • 1310 Words
    • 6 Pages

    Determining the limiting reactant and the percent yield i a precipitation reaction

    precipitation reaction will be studied. Stoichiometry will then be used to investigate the amounts of reactants…

    • 1310 Words
    • 6 Pages
    Good Essays
    Read More
  • Better Essays

    Standard Bleach Lab
    • 797 Words
    • 4 Pages

    Standard Bleach Lab

    The overall objective of this experiment is to determine the mass percent of NaClO, sodium chloride, in standard bleach. The purpose of part 1, is to standardize Sodium Thisulfate, Na2S2O3, with the primary standard Potassium Iodate, KIO3. The standardized Na2S2O3 will then be used in Part 2, to help determine the mass percentage of sodium chloride in bleach. The chemical equation used in standardizing sodium thisulfate is, IO3- (aq) + 5I- (aq) + 6H+(aq) ---> 3I2 + 3H2O followed by I2 (aq) + 2 S2O3-2 (aq) ---> 2I- (aq) + S4O6-2 (aq). This reaction shows that when KIO3 and KI are combined under high acidity, I- is oxidized by IO3- and forms I2. Once sodium thisulfate is added to the mixture, I2 is reduced to I-, once again. Once all of the iodide is used up in the reaction, the liquid will changed from brown/yellow to clear. This means that the solution has reached an equivalence point. Since I2 changes the color of the solution, it will be used as an indicator in the titration experiment. In part 2 of the experiment, Na2S2O3 is used to determine the mass percent of NaClO in bleach. The reaction related to this part is as follows: ClO- (aq) +…

    • 797 Words
    • 4 Pages
    Better Essays
    Read More
  • Satisfactory Essays

    Chemical Change Lab Report
    • 325 Words
    • 2 Pages

    Chemical Change Lab Report

    There are many substances used in this experiment, the elements are Hydrogen Gas, Aluminum, and solid Copper, the compounds are Copper II Nitrate, Sodium Hydroxide, Copper II Hydroxide, Copper II Oxide, Hydrochloric Acid, Sodium Nitrate,…

    • 325 Words
    • 2 Pages
    Satisfactory Essays
    Read More
  • Better Essays

    Landolt Iodine Clock Reaction: Oxidation Of Bisulphite
    • 1191 Words
    • 5 Pages

    Landolt Iodine Clock Reaction: Oxidation Of Bisulphite

    Their experiment also tested heat using calorimetry. It was concluded that their results were linear and no reaction occured when the NaHSO3 was high. This lack of reaction can be attributed to the concentration of the NaHSO3 being too high to react with not enough KIO3 reactant to change the solutions colour. Their findings of linear results differ to our experiment as well as others. Their process involved other steps that are different to how our experiment was conducted.…

    • 1191 Words
    • 5 Pages
    Better Essays
    Read More
  • Good Essays

    Kelor Chemical
    • 457 Words
    • 2 Pages

    Kelor Chemical

    From the Exhibit 4, U.S. Frasch Sulphur Industry Prices and Profitability, 1940-1967, we can get the information about the variations in the return on invested capital earned by the industry over the several decades. In sulphur industry, the return on invested capital was around 15% from 1940 to 1945. From 1946, rate of return began to increase dramatically, starting from 16.2 %( 1945), and reached 33.8% in 1950. This high rate of return kept for couples of years (1951-1955), ranging from 29% to 31%. Starting from 1956, rate of return on invested capital in sulphur industry dropped sharply, all the way back to the profitability level of early 40’s 15% rate of return in only 2 years. This fall did not stop until the rate of return dropped to as low as 7.5% in 1963 where the very bottom was. From 1964, the profitability started to rise again. The rate of return went back to the original 15% level in 1966.…

    • 457 Words
    • 2 Pages
    Good Essays
    Read More
  • Good Essays

    Chemical Reaction Equilibrium
    • 594 Words
    • 2 Pages

    Chemical Reaction Equilibrium

    On the first part of the experiment the effect of concentration was tested. Four test tubes was prepared, on the 1st tube 5.0 mL of 0.02M KSCN and 5 ML of distilled water was added then the appearance of the solution was observed. The solution prepared on the 1st tube was then divided into the remaining test tube and tube 1 was used as the reference for comparison. On the 2nd tube small crystal of KSCN was added. On the 3rd tube 1 drop of 0.02M Fe (no3)3 was added. And on the 4th tube 2 drops of 0.02M Nah2PO4 was added. The appearance of the solution on the test tubes was then observed and recorded.…

    • 594 Words
    • 2 Pages
    Good Essays
    Read More

Related Topics