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Part B. Rate of Reaction Under Increased Pressure
PUT ON YOUR SAFETY GOGGLES!
Fill the 16 x 150 mm test tube 1/2 full of water. The water should be about room temperature.
Break an Alka-Seltzer tablet in half. Drop the pieces into the test tube.
Immediately insert the cork stopper in the end of the test tube to slow down the escape of carbon dioxide gas. The pressure being exerted upon the reactants inside the test tube is equal to the pressure you feel being exerted against the cork.
Note: Do not try to stop all of the gas from escaping! If you try to do so, the test tube will break. Just slow down the escaping gas as pressure builds up inside of the test tube. That pressure acts upon the surface of the liquid. The liquid moves in a direction that will relieve the pressure. The only direction, without breaking the test tube, is upward and out. Avoid a total "blow-out" of the liquid from the tube by releasing enough pressure on the cork from time to time to let gas and liquid "squeeze" its way past the cork, in controlled amounts. This is a struggle; you against the gas pressure.
When gas bubbles are no longer visible in the liquid contained in the test tube, consider the reaction to be over. Observe and record the time of the reaction.
Release the pressure on the cork. Note that the reaction starts again. Increase pressure on the cork and the reaction stops.
Note that there is still a small amount of Alka-Seltzer left in the bottom of the test tube. You have now reached the point when you are able to exert enough pressure to be equal to the pressure being exerted by the gas inside the test tube. As a result, the reaction stops. When you release your pressure, the reaction is able to start again.
Remove the cork. Observe and record what happens to the remaining Alka-Seltzer.
