Lab+4+Hypothesis+Testing

OR, put the plastic container on the and push the "tare" button on the left once. The scale should now read 0.0 g. If it doesn't say "g" push the button once on the right to get grams.
 * EXERCISE 2: STANDARDIZING EQUIPMENT**
 * Materials:** pipettor, scale, 5 ml pipette, graduated cylinder.
 * Methods:**
 * 1.** zero a small plastic container on the scale. Place the cup on the scale and turn it on. It should read 0.0
 * 2.** 5 mls of water to the container and record the weight. Without taring or rezeroing the scale, add another 5 ml and record the weight. Continue another 3 times (5 times total). If your PRECISION using the pipettor is good you should read an exact multiple of the first aliquot of water you put into the cup.

The portion of a total amount of solution. For more info click Here Concave up concave down of a column of liquid. For online definition click Here My scale was very accurate. water in (ml) || Scale Calculations in (g) || Very precise. See Table 1
 * Part 1 Questions**
 * 1. What does aliquot mean?**
 * 2. What is the definition of the meniscus?**
 * 3.HOW ACCURATE WAS YOU SCALE?**
 * **Table 1** ||
 * Amount of
 * 5ml || 5g ||
 * 10ml || 10g ||
 * 15ml || 15g ||
 * 20ml || 20g ||
 * 25ml || 25g ||
 * 4.HOW PRECISE were your aliquots?**

Now test the graduated cylinder for accuracy by weighing out 100 ml of water and pouring it into the graduated cylinder. Repeat this 2 more times. Yes it does read 300ml. water in (ml) || Scale Calculations in (g) || None
 * Part 2**
 * 5.Does it read 300ml?**
 * **Table 2** ||
 * Amount of
 * 100ml || 268g ||
 * 200ml || 368g ||
 * 300ml || 468g ||
 * 6.How much water was left in your cup or container?**

Dry the container. Weight out 100 ml of water. Dump the water and without turning off the scale (which would zero it again) reweigh the "empty" container. Subtract the dry weight and the "wet" weight of the container Wet Weight = 168 g Dry Weight = 167g Missing Water = 1 g Not very accurate because the plastic makes it hard to read the right amount of the meniscus. The lines on the glass cylinder makes it a lot easier to read the the measurements.
 * Part 3**
 * 7.Does this account of any missing water?**
 * 8.HOW ACCURATE IS THE GRADUATED CYLINDER?**

Bounty absorbs more water then the bargain brand. Video Click Here There have been others to do the same experiment as me. For more information on how to do the experiment Click Here Based on the thickness of the 3 different types of towel, sample will adsorb the most amount of water. 1. I gathered all the materials needed 2. I poured 100ml of water into a container. 3. Place Sample A into the graduated cylinder. 4. Took out the Sample A. Samples A,B, and C 5. Subtracted the water that was left from 100ml, which was my starting point. 6. Repeated the steps 1-6 for Sample B and C. 7. Do this 3 times. 8. Record your data. Different brands of paper towels. Thickness of paper towel. Amount of water. absorbed (ml) || Amount of water left in the container (ml) ||
 * EXERCISE 3: DESIGN AND RUN AN EXPERIMENT**
 * OBSERVATION**
 * HISTORY**
 * HYPOTHESIS**
 * METHOD**
 * VARIABLES**
 * CONTROLS**
 * RESULTS**
 * Paper Towel || Amount of
 * Sample A || 25ml || 75ml ||
 * Sample B || 25ml || 75ml ||
 * Sample C || 15ml || 85ml ||
 * Sample A || 25ml || 75ml ||
 * Sample B || 24ml || 76ml ||
 * Sample C || 25ml || 75ml ||
 * Sample A || 25ml || 75ml ||
 * Sample B || 25ml || 75ml ||
 * Sample C || 15ml || 85ml ||
 * Sample B || 25ml || 75ml ||
 * Sample C || 15ml || 85ml ||

Based on my data it appears that Sample B was the most absorbent paper towel because it was the thinnest and it absorbed and 24.66ml of water. Sample C averaged 18.33ml of water. It the lest absorbent because it was the second thickest paper towel and Sample A averaged 25ml water. Sample A was the thickest paper towel.
 * DISCUSSION**