Solution rate inquiry lab:
For class, we have to design our own lab given the info from class.
My question is: Does the INTRO, HYPOTHESIS, PROCEDURE, & DATA CHART all make sense? I feel like I'm missing something or the hypothesis could be fixed or all the above factors BOLDED could be changed. PLEASE HELP. LAB 1/18/2017 .....
SOLUTION RATE INQUIRY LAB
INTRO: (technically we didn't do the lab yet and the 1st sentence seems as if we did... rewording?)
When performing a solubility experiment, using a stirring rod to move the solvent around the solute causes portions of the solvent to come into contact with the liquid, which in turn makes it dissolve faster. In this experiment we’ll be testing how long it takes for rock salt to dissolve in different temperatures of water by stirring the two substances.
Materials:
•3 test tubes
•Stirring rod
•Distilled water
•NaCl (rock salt)
•Stopwatch
•Balance
•Bunsen Burner
•Wire Gauze
•Striker
•Test tube clamp
Hypothesis:
If you use a stirring rod to mix salt in different temperatures of distilled water, then the rate of solubility will increase.
Procedure: (3 trials testing the temperature of water in room temperature water, cold water, and hot water and how long it takes for the salt to be dissolved)
Do these steps or procedure make sense?
Part 1/Trial 1:
1.Measure 20 mL of room temperature distilled water with a graduated cylinder
2.Then pour the 20 mL of distilled water into a test tube.
3.Next measure out 1 gram of salt
4.Get out the stirring rod and stopwatch
5.Carefully pour 1 gram of salt into the room temperature distilled water
6.Start your stopwatch and begin stirring.
7.Keep track of time while stirring!
8.When the salt is completely dissolved, record the stop time into your data chart.
Part 2/Trial 2:
1.Measure 20 mL of room temperature distilled water with a graduated cylinder
2.Then pour the 20 mL of distilled water into a test tube
3.Next measure out 1 gram of salt.
4.Get out the stirring rod and stopwatch.
5.Carefully pour 1 gram of salt into the cold distilled water
6.Start your stopwatch and begin stirring.
7.Keep track of time while stirring!
8.When the salt is completely dissolved, record the stop time into your data chart.
Part 3:
(BC in this trial, heated water is usen, I was thinking these steps but not sure where to include them or if it's right or makes sense: 1. Use the striker to ingite the Bunsen burner.
2. Then use the test tube clamp to clamp the test tube.
3. Hold the test tube clamp at a 45° angle at the top of the inner blue cone.)
.........
1.Measure 20 mL of room temperature distilled water with a graduated cylinder
2.Then pour the 20 mL of distilled water into a test tube
3.Next measure out 1 gram of salt.
4.Get out the stirring rod and stopwatch.
5.Carefully pour 1 gram of salt into the cold distilled water
6.Start your stopwatch and begin stirring.
7.Keep track of time while stirring!
8.When the salt is completely dissolved, record the stop time into your data chart.
Here is the chart (does this make sense):
Left Column: Column 1(temp)| Column 2 (time)
Row 1: test tube/ trial 1
Row 2: test tube/ trial 2
Row 3: test tube/ trial 3
R1C1= room temp
R2C1=Cold temp
R3C1= heated temp
______________________
R1C2, R2C2, R3C2=time (haven't done experiment yet!!!)
Sorry, I tried to condence it. Hopefully someone can help me clarify! Would really appreciate it!
The Intro, Hypothesis, Procedure, and Data Chart seems to be well-structured for your solubility experiment. However, there are a few areas that can be improved or adjusted. Let's go through each section:
1. Intro:
You are right that the first sentence in the introduction might be misleading since you haven't done the experiment yet. You can reword it by saying, "When performing a solubility experiment, it is believed that using a stirring rod to move the solvent around the solute causes portions of the solvent to come into contact with the solid, resulting in faster dissolution. In this experiment, we will be investigating the rate of dissolution of rock salt in different temperatures of water by stirring the two substances."
2. Hypothesis:
Your hypothesis is clear and concise. It states, "If you use a stirring rod to mix salt in different temperatures of distilled water, then the rate of solubility will increase."
3. Procedure:
For Part 1 and Part 2, the steps outlined make sense, and you have mentioned all the necessary measurements and actions to be taken.
For Part 3, where you plan to use heated water, you can include those additional steps you mentioned:
1. Use the striker to ignite the Bunsen burner.
2. Then use the test tube clamp to clamp the test tube.
3. Hold the test tube clamp at a 45° angle at the top of the inner blue cone.
4. Data Chart:
Your data chart format is correct, indicating the temperature in the left column (Column 1) and the time in the right column (Column 2). The rows correspond to each trial.
Overall, your lab design and your understanding of the steps and components are satisfactory. By making the mentioned adjustments, your lab will be well-organized and easy to follow. Good luck with your experiment!
The intro provides some background information on the experiment, but it can be reworded to make it clear that the experiment has not been conducted yet. Here's a revised version:
"In this experiment, we will investigate the solubility rate of rock salt in different temperatures of water by stirring the mixture. Stirring the solvent and solute together enhances the contact between them and promotes faster dissolution. By measuring the time it takes for the salt to dissolve, we can determine the effect of temperature on solubility."
Your hypothesis is concise and appropriate. It predicts that using a stirring rod to mix salt in different temperatures of distilled water will increase the rate of solubility.
The procedure is well-structured and includes step-by-step instructions for each trial. For Part 1 and Part 2, you have listed the steps clearly. However, for Part 3, where heated water is used, you mentioned the additional steps of igniting the Bunsen burner, clamping the test tube, and holding it at a specific angle. These steps should be included before proceeding with the measurement of 20 mL of room temperature distilled water and the rest of the procedure. Here's a revised version for Part 3:
Part 3: (Heated Water Trial)
1. Use the striker to ignite the Bunsen burner.
2. Use the test tube clamp to clamp the test tube.
3. Hold the test tube clamp at a 45° angle at the top of the inner blue cone.
4. Measure 20 mL of room temperature distilled water with a graduated cylinder.
5. Pour the 20 mL of distilled water into the test tube.
6. Measure out 1 gram of salt.
7. Get out the stirring rod and stopwatch.
8. Carefully pour 1 gram of salt into the heated distilled water.
9. Start your stopwatch and begin stirring.
10. Keep track of time while stirring!
11. When the salt is completely dissolved, record the stop time into your data chart.
The data chart you provided makes sense. The left column indicates the temperature of the water in each trial (room temperature, cold, and heated), while the right column will be used to record the time taken for the salt to dissolve.
Overall, the intro, hypothesis, procedure, and data chart are well-structured with a few minor adjustments. Good luck with your experiment!