Lab 1.3 Report

The first thing that happened was measuring out the vinegar. The first cup got 1/4 cup of vinegar in it, the second cup got 1/2 cup of vinegar, and the third cup got 1 cup of vinegar. Then, 1 Tums tablet was dropped in each cup at the same time and the time it took each one to dissiolve was timed. After that, each cup was washed out. For the next part of the experiment, the same amounts of vinegar as before were poured in. In addition to the vinegar, the first cup recieved 1 3/4 cups of water, the second cup recieved 1 1/2 cups of water, and the third cup recieved 1 cup of water. 1 Tums tablet was dropped in each cup at the same time, just as before, and the time it took each tablet to dissolve (or nearly dissolve) was timed.

Vinegar, 6 Tums tablets, water, measuring cups, 3 large glasses, a spoon, and eye protection.

Materials

Procedure

For the first round (the round without water): 2 min. 50 sec: all of the tablets are almost dissolved. 5 min. 20 sec: the tablet in the third cup is completely dissolved. 5 min. 25 sec: the tablet in the second cup is almost dissolved. 5 min. 40 sec: the tablet in the second cup is completely dissolved. 5 min. 58 sec: the tablet in the first cup is completely dissolved. Now for round 2 of the experiment (the round with water added too): 16 sec: tablets start dissolving. 36 sec: the third cup is dissolving faster than all the other cups. 57 sec: the tablet in the first cup is barely dissolving. 1 min. 59 sec: the tablet in the first cup is losing chunks, but is not dissolving. 3 min. 44 sec: the tablet in the third cup is almost dissolved. 5 min. 14 sec: the tablets in cups 1 and 2 are continually bubbling. 6 min. 50 sec: the tablet in the third cup is the size of a dime. 7 min. 47 sec: the tablet in the second cup is the size of an asprin pill. 9 min: there is powder at the bottom of the first cup, but the tablet is not dissolving very fast.10 min 27 sec: the tablet in the third cup is completely dissolved. 12 min. 16 sec: the tablet in the second cup is almost dissolved. 13 min. 19 sec: experiment is stopped, but neither of the tablets in cups 1 or 2 have completely dissolved. What we can learn from this is that the concentration of a chemical substance will determine what outcome it will have; whether it be dissolving something, ingesting something, etc. The first round of the experiment was pretty short and close together because while the amount of liquid in each cup was different, the concentration was the same. In round 2 of the experiment, both the amount and the concentration of liquid was changed. The result of this was a longer experiment and different dissolving rates. The hypothesis was right.

Result

Lab 1.3 Report

I predict that the lower the concentration of vinegar in each glass, the slower the Tums tablets will dissolve.

Hypothesis