Preview

Labreport Solubility

Better Essays
Open Document
Open Document
2285 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Labreport Solubility
TITLE:
Solubility and Thermodynamics

PURPOSE:
The purpose of the lab was to determine the thermodynamics variables of ∆H, ∆S, and ∆G for the dissolution reaction of potassium nitrate in water. The solubility of potassium nitrate in mol/L was measured over a range of various temperatures by finding out at what temperature crystallization began for solutions of different molarities. Then, the equilibrium constant was calculated and a graphical relationship between the natural logarithm of the equilibrium constant and the inverse of the temperature gave a linear plot that allowed the determination of Gibbs free energy and enthalpy changes associated with the reaction. From there, the entropy change associated with the reaction was determined.

PROCEDURE: 1. Weigh out 20.0g of potassium nitrate and transfer it to a 25x200mL test tube. Do not ingest the potassium nitrate 2. Add 15 mL of water and heat the test tube in a boiling water bath, stirring until all of the potassium nitrate dissolved 3. Determine and record the volume of the potassium nitrate solution. Use a second large 25x200mm test tube and fill it with an equal volume of water. Then, measure that volume in a graduated cylinder 4. Remove the test tube with the potassium nitrate from the water bath and allow it to cool while slowly stirring the solution with a thermometer 5. Record the temperature when crystals first appear. It is assumed that at this temperature, the system is at equilibrium and it is possible to calculate the concentration of the ions 6. Add 5mL of water to the test tube and warm mixture in a hot water bath until all solid dissolves. Determine the solution volume as before and record it 7. Cool the solution slowly and record the temperature at which crystals first appear 8. Repeat the cycle of adding water/heating/cooling/recording temperature until crystals appear near room temperature. Add 5mL of water each time

DATA & OBSERVATIONS: 1. 20.00g

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Halide Ions Lab

    • 618 Words
    • 3 Pages

    Drain the 4 test tubes and refill them with clean solutions. (NaF, NaCl, KBr, KI) This time add 2.5 mL (20 drops) of 0.1 M AgNo3 to each of the test tubes. Observe and record in the data table.…

    • 618 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Chem Lab report

    • 452 Words
    • 2 Pages

    9) Put 4mL of stock solution and 1mL of water in a test tube to make the second solution.…

    • 452 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    3. Add 10-20 drops of each known solution to respective test tubes, do not mix pipets!…

    • 372 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    paper1

    • 374 Words
    • 2 Pages

    Gently stir until crystals form. Then raise test tube out of the bath and record temperature to the nearest .2 C every 30 seconds until the temperature reaches about 12 C to 15 C.…

    • 374 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Saline solution lab

    • 289 Words
    • 2 Pages

    2. Record how many mL of solution you add into the evaporating dish then mass them together.…

    • 289 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Making Salt Lab

    • 384 Words
    • 2 Pages

    3. Add 1g of NaHCO3(sodium bicarbonate) to the test tube with the scoopula, then measure.…

    • 384 Words
    • 2 Pages
    Good Essays
  • Good Essays

    5-10 mL of boiling water into the flask containing the impure substance- does not need to be exact 5. After water is added, swirl the mixture for one minute while maintain the solution temperature on the hotplate. 6. Continue adding small amounts (3-5 mL) of boiling water until the unknown solid is fully dissolved. Make sure to swirl the…

    • 517 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Corn and Milk Lab

    • 290 Words
    • 2 Pages

    5)Pour a little amount of each of the substances into their test tube, add 30 drops of water with a pipet.…

    • 290 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Be sure that the water does not boil too strongly and if it does occur reduce the heat. Put 12 test tubes on the test tube rack and label them 1 through 12 on the top of the tube using wax pencils. Use the ruler to draw a line at 3 cm and 6 cm on the test tubes using the wax pencil. Fill the test tube up to the 3 cm line with the solution to be tested and fill up to the 6 cm line with Benedict’s reagent. Invert test tubes to mix the liquid. Place the test tube in the hot water bath for 3 minutes and remove with test tube holder. Observe the results and record the data in table 4 then repeat all steps with the remaining 11 test tubes and substances. Once finished dispose of all solutions in hazard container and clean the test tubes with soap and water.…

    • 1115 Words
    • 5 Pages
    Powerful Essays
  • Satisfactory Essays

    Sugar Gradient Lab Report

    • 383 Words
    • 2 Pages

    Drop 10-20 drops slowly down the side of the inside of the same test tube.…

    • 383 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Butanol Lab

    • 466 Words
    • 2 Pages

    2. Add 10 drops of concentrated HCl to each of the three test tubes. Shake the mixtures very gently.…

    • 466 Words
    • 2 Pages
    Good Essays
  • Good Essays

    9. Fill your cylinder with enough water so that when the sample is dropped in, it will be completely submerged (80mL was used in this experiment).…

    • 836 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    Galvanic Cells

    • 283 Words
    • 2 Pages

    1. Clean the copper, M(1), M(2) and M(3) before starting the experiment. Sand with a fine grade sand paper to take off the outside coating.…

    • 283 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Simple Sugar Lab

    • 608 Words
    • 7 Pages

    6. Using test tube holders, warm the test tubes in the hot water bath for 5 minutes. record…

    • 608 Words
    • 7 Pages
    Good Essays
  • Good Essays

    Lab Solubility

    • 1220 Words
    • 5 Pages

    2) To the beaker with the salt, add 100mL of distilled water and add a thermometer.…

    • 1220 Words
    • 5 Pages
    Good Essays