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The Challenge for this weeks worksheet is to use the numbers obtained by a student to complete the “Identification of unknown Metal Carbonate” pages in the lab manual (pg 65-66) then submit a pdf copy to the Gradescope page. Deadline Friday Oct 9 at 5 pm.
A video of the experimental basics is athttps://www.youtube.com/watch?v=V6jP1Jt59Xc
To prepare for the experiment you need to read the lab manual pg 59-63, paying specific attention to how the mass percent of CO2 is determined for a compound. You will need to calculate Mass percent of CO2 for each of the Carbonates listed in table 9-3. Remember that if you have a “hydrate” as shown on page 60, you must use the entire Molar mass including the number of water molecules to find the correct theoretical percent CO2.
The goal is to use the numbers generated by a student to find your unknown.
The scene:
A student weighed a beaker and test tube, mass was determined as 129.02 g.
Some Lithium Carbonate was added and now the mass was 130.22 g.
Acid was added to the test tube and the total mass before reaction was 139.73 g.
The acid was dumped into the beaker (see video for observations) and now the entire assembly weighed 139.01 g.It is up to you to use these numbers to make sure you know how to do the calculations and get the correct mass percent for Lithium Carbonate.
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