Heat (whether it was consumed or evolved) can also be an indicator that reaction occurred, but you may not be able to tell in these videos. You will know that a reaction occur if a precipitate, a gas, or color change occurred. Keep in mind that some reactions will not occur and you should write NR (for No Reaction). Indicate if a gel is produced or crystals form, if the solid was powdery, etc. Don't write “became cloudy” or “white solid”. Before proceeding with this or any other experiment students must sign the chemical lab safety form.įor each reaction in Part A and Part B record your observations, molecular equation, total ionic equation and net ionic equation. Make sure to write any evidence of a chemical reaction with sufficient detail to help you distinguish between similar precipitation reactions.
Calcium chloride precipitation skin#
Clean up all spills immediately! If contact with skin rinse with water for 15 minutes.Do non ingest any chemicals or inhale the vapors.Safety if you were to complete this lab in person: Compounds that do not dissolve in water remain a solid and indicated by "(s)". Use a graduated cylinder to add 20 mL of water to each. You might have heard that water is the universal solvent, however, water only dissolves substances that are hydrophilic (from the Greek "hydros" - water and "philia" - bonding or friendship). Use masking tape and a pen to label 2 plastic cups baking soda solution and calcium chloride solution. For example, NaCl(aq) present as individual ions Na + and Cl - dissolved in water. In chemistry aqueous solution indicated by adding "(aq)" to the reactant formula. Rain, vinegar, orange juice are all examples of aqueous solutions that you come across in your everyday life. 3.1: Introduction to Chemical EquationsĪqueous solution is any solution where water is present as a solvent.
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