Volume Measurements: Questions, Errors, Limitations

[Saturnfirefly]

Please, please look at the document I've attatched.

My questions are:

Have I done the calculations correct? Do I have correct significant figures?


I have to discuss the random and systematic errors... but I don't know what ones that we've had. Help? And they tell us to point out relevant weaknesses and limitations of the method used (measuring the amount of water by weighing it and the beaker etc.) and how we can improve this.

Well... one systematic error is that weighing the water will not give us the exact amount in milliliter as it can vary because of the temperature and pressure...am I on the right track? And that is then a limitation...?

Gah. I don't know anything more. I'm in IB first year btw, even though it says second year (first year after pre-IB)... if you wondered.

 

[Moonbear]

Your problem set really doesn't explain how you got any of the answers you've provided.

So, let's backtrack a bit. What is a random error, and what is a systematic error? Let's make sure you have those basic concepts correct before moving on to see if you've applied them correctly.

 

[Blueshift5]

First of all, it is great that you are questioning your calculations and significant figures. It is important to always double check your work to ensure accuracy.

In terms of random and systematic errors, it is important to understand the difference between the two. Random errors are unpredictable and can occur due to human error or environmental factors. On the other hand, systematic errors are consistent and can be attributed to a flaw in the experimental setup or equipment.

In your case, one potential systematic error could be the use of a beaker to measure the volume of water. Beakers are not as precise as graduated cylinders or pipettes, so this could introduce some error in your measurements. Additionally, as you mentioned, factors such as temperature and pressure can also affect the volume of water measured by weighing it.

To improve this method, you could use more precise measuring tools such as graduated cylinders or pipettes. You could also take multiple measurements and calculate an average to reduce the impact of random errors. Additionally, controlling the temperature and pressure of the environment could help to minimize the impact of these factors on your measurements.

It is important to also consider the limitations of any method used in scientific experiments. In this case, the limitation would be the use of weighing as a method for measuring volume. While it may be convenient and easy to do, it is not as accurate as using more precise measuring tools.

Overall, it is important to be aware of potential errors and limitations in any scientific experiment and to continuously look for ways to improve and minimize them. Keep questioning and seeking clarification, as this is a crucial part of being a scientist. Good luck with your studies!