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Homework answers / question archive /  Determine if your unknown is Na2323·      Mass of unknown in the video: 1

 Determine if your unknown is Na2323·      Mass of unknown in the video: 1

Chemistry

 Determine if your unknown is Na2323·      Mass of unknown in the video: 1.96 g

CO or KCO.

·      Be sure to record the steps of weighing, dissolving, doing the double displacement reaction, filtering steps, and final drying of the sample.

·      Be sure to record the mass of the filter paper before the CaCO3 is filtered: 0.40 g

·      They say they will dry the precipitate and filter paper on a watch glass in an oven. An alternate procedure to do the lab on the same day is to wash the precipitate with acetone three times (volatile solvent) and air-dry for 15 to 20 min.

·      The video ends before the final mass of the dried CaCO3 is obtained. Record the value of the final mass of filter paper plus the solid is 2.21 g.

 

Post-Lab analysis:

Find the mass of CaCO3 precipitate.

Find the moles of CaCO3 precipitate.

How many moles of unknown (Na2CO3 or K2CO3) is there in the sample?

What is the molar mass of unknown?

Identify unknown as Na2CO3 or K2CO3 based on the molar mass.

Calculate the percent error in your experimental molar mass.

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