Question

Properties of Gases

Peter Jeschofnig, Ph.D.      Version 42-0189-00-01

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment

Answer 1

1) The first reason is because we want to obtain pure gas and by minimizing the amount of air in the top this will maximize the gases purity. Also some gases may react differently with air. Minimizing contact with air assures a better outcome

2) It dissolved and formed hydrogen and zinc chloride.

3) The manganese seemed like a catalyst because it sped up the rate of the chemical reaction.

4) 2H2 + O2 ==> 2H2O

5) The Bromothymol blue changed color from clue to green and then it turned yellow. After the CO2 was mixed with water, I think carbonic acid was formed. This can measure the amount of CO2 present, a lot of CO2 will show yellow and very little or no CO2, the bromothymol will remain blue

6) it is green because pH is 7-.7.5 near neutral PH... is leads to green color