Hi can someone me with couple of my lab questions .

In summary, the conversation discusses a lab on determining the chemical formula of a hydrate (CuSO4.xH20). The questions focus on how the calculated percent by mass of water in the compound and the molecular formula would be affected if the hydrate was heated too quickly and some of it was lost. It is suggested that the mass and molecular formula would change due to the loss of water molecules. Additionally, the conversation mentions the method for determining the molecular formula using the masses of the empty beaker, hydrated copper (II) sulfate, and anhydrous copper (II) sulfate. It is also noted that further clarification is needed on the concept of finding X.
  • #1
mary_k
1
0

Homework Statement



k so we are doing a lab on determining the chemical formula of a hydrate (CuSO4.xH20) wat i need help on is these following questions:
1. suppose the hydrate was heated too quickly and some of it was lost as it spattered out of the container explain how this would affect
a) the calculated percent by mass of water in the compound.
b) the molecular formual you determined.

wat i think da answer to
1a) wuld bee that mass wuld change because some of solution spattered and since it was heated too quickly da water is not completely evaporated :confused:

and for 1b) da molecular formula wuld change because thur wuld be more water molecules...

nd other question i don't get is that
2.how wuld u determine the molecular formual of CuSO4.xH20
based on this information
Mass of empty beaker or evaporating dish - 185.6g
Mass of beaker or evaporating dish + hydrated copper (II) sulfate. 190.1g
Mass of beaker or evaporating dish + anhydrous copper (II) sulfate. 191.2g

do u hafto find X first :confused: ?
 
Physics news on Phys.org
  • #2
Wow my chemistry is very bad. I can't really help you specifically. But for 1a) simply stating that it changes is not enough. You have to state whether it increase, or decreases, or if it stays the same and why. Would it really change? Think about what it is that you calculated (percent by mass of water in compound).

1b) Again must state how it would change. Why would there be an increase in water molecules when you have less water now?
 
  • #3


Hello, I am a scientist and I would be happy to help you with your lab questions. It is important to make sure that experiments are conducted carefully and accurately, so it is good that you are seeking clarification on these questions.

1a) If some of the hydrate was lost due to spattering, it would affect the calculated percent by mass of water in the compound. This is because the mass of the hydrate would be lower than expected, resulting in a higher percentage of water in the compound. This would lead to an inaccurate calculation.

1b) You are correct in thinking that the molecular formula would also be affected by the loss of some of the hydrate. If there are more water molecules present, the formula would change to reflect this. It is important to accurately determine the amount of water present in the compound to determine the correct molecular formula.

2) To determine the molecular formula of CuSO4.xH20, you would need to first find the value of x. This can be done by comparing the mass of the empty beaker or evaporating dish to the mass of the beaker or evaporating dish with the hydrated and anhydrous copper (II) sulfate. The difference in mass would represent the mass of the water that was present in the hydrate. Using this value, you can then determine the value of x in the formula CuSO4.xH20.

I hope this helps you with your lab questions. Remember to always be careful and precise in your experiments to ensure accurate results. Good luck with the rest of your lab!
 

Related to Hi can someone me with couple of my lab questions .

1) What kind of lab questions do you need help with?

It would be helpful if you could provide more information about the specific lab questions you need assistance with. This will allow me to better understand your needs and provide more targeted help.

2) Can you provide the instructions or materials for the lab questions?

In order to provide accurate and helpful responses, it would be beneficial to have the instructions or materials for the lab questions you need help with. This will allow me to better understand the context and provide more detailed explanations.

3) How much detail do you need for the answers?

Please let me know if you need brief and concise answers or if you need more in-depth explanations for the lab questions. This will help me tailor my responses to your specific needs.

4) Are there any specific concepts or topics that you are struggling with?

If there are specific concepts or topics that you are having trouble understanding in relation to the lab questions, please let me know. This will allow me to focus on those areas and provide more targeted help.

5) How much time do you have to complete the lab questions?

It would be helpful to know the timeframe you have to complete the lab questions. This will allow me to provide responses that are timely and can assist you in completing the questions within your allotted time.

Similar threads

  • Biology and Chemistry Homework Help
Replies
4
Views
7K
  • Biology and Chemistry Homework Help
Replies
1
Views
15K
  • Biology and Chemistry Homework Help
Replies
2
Views
108K
  • Biology and Chemistry Homework Help
Replies
2
Views
16K
  • Biology and Chemistry Homework Help
Replies
16
Views
21K
  • Biology and Chemistry Homework Help
Replies
3
Views
50K
  • Biology and Chemistry Homework Help
Replies
5
Views
11K
  • Biology and Chemistry Homework Help
Replies
2
Views
4K
  • Biology and Chemistry Homework Help
Replies
2
Views
8K
  • Biology and Chemistry Homework Help
Replies
2
Views
4K
Back
Top