Mass Lab #6

This lab had the film canister with the water and the cap with the Alka Seltzer tablet which were massed separately and then the tablet was added to the water with the cap on and was massed again.

Claim: The mass decreased slightly.

Evidence: On the histogram with everyone's results the average change in mass after the tablet was added to the water was between -.43 and -.21. There was an outlier that changed between -3.03 and -2.31.

Reasoning: I think that the mass slightly decreased once the tablet was added to the water because of the chemical reaction happening on the inside of the canister. There was a lot of pressure which caused the cap to slightly pop off. Between the time that the cap slightly came off and we pushed it back on, I believe that is when some of the particles escaped. That is the reason the mass was slightly less after the two things were combined is because some of the particles that were part of the mass in the system before got out of the system by the time it was all massed the second time.