Calorimetry labs measurements

How do you measure the volume of liquid in the graduated cylinders in the calorimetry labs? What is the uncertainty on the measurement?
Is there a way to tell if all solids have dissolved during a solubility reaction?
Is there a way to request more chemicals be included such as alcohols with longer chain lengths to allow for more variety in labs?

Oh- great questions! I would absolutely recommend the Help menus for this type of question about the technicalities of the simulation assumptions and algorithms. You can access Help from the lab landing pages or with the bell on the stockroom counter in each lab.

  1. If you drag a graduated cylinder under the faucet it will fill till its full automatically.
    From the Help files: “Graduated Cylinders. There are four graduated cylinders (10, 25, 50, and 100 mL), and they are used to measure volumes of reagents and water with intermediate accuracy and reproducibility.” and from another section: “The volume of liquids delivered by the graduated cylinders will not be the exact volumes as labeled on the graduated cylinder. Instead, the volumes delivered will have inaccuracies and randomness typical of actual graduated cylinders.”
    I checked with the creator of this lab and he said that they made the uncertainty of the cylinders match the typical uncertainty in a real lab.

  2. Dissolving question: " if a solid reagent is added to the solution, the second reagent for a reaction cannot be added until the dissolution process (or the heating) has finished." and “When solids are dissolved in water and when solutions are mixed, the resulting solution volumes are calculated using the first-order, partial molar volumes for each ionic and nonionic species in the solution. Using these first-order, partial molar volumes will generally produce total volumes that are accurate to within 0.1% to 0.3% of the actual volume. Suitable estimates of partial molar volumes were made for species not found in the literature.”
    The creator said: “If soluble then it is always completely soluble.”

  3. It looks like we currently only have up to pentanol for longer chain alcohols. There are currently 54 different organics (plus the 35 salts and all the Reactions combinations) on the shelves in Calorimetry, so there are certainly a lot of options there! We don’t currently have programming capacity to build in new chemicals. Hopefully by next year when our program is up in html5 it will be easier to do that.

Let us know if you have further questions!