Heat of reaction

  • Thread starter msdel
  • Start date
5
0
I conducted an expereiment where I added 5.5g of NaOH into 200ml of 1.0 mol/l of HCl. Ive done all the calculations required but there is a questoin im just not sure about. It asked if i was to add 11.0g of NaOH instead of the 5.5g i used would this have an effect on the amount of heat evolved? I was thinking that the heat evolved would stay the same...

Can anyone help me understand this one?

Thanks
 
1,100
25
Look up the heat of formation data for HCL and NaOH. If the sum of those two is negative then the enthalpy of the reaction will decrease if you use twice as much NaOH since the enthaply of a reaction is directly related to the amount of starting material you use. If the sum of those two is positive then the enthalpy of the reaction will increase.
 
Last edited:

LeonhardEuler

Gold Member
858
1
Since NaOH has a mol. wt. of 40g/mol, 5.5g of it is only about .14 mol. You used .2 mol of HCl, so adding more NaOH would cause a further reaction. This would increase the heat evolved.
 

Related Threads for: Heat of reaction

  • Posted
Replies
5
Views
9K
  • Posted
Replies
2
Views
2K
  • Posted
Replies
5
Views
3K
  • Posted
Replies
2
Views
4K
  • Posted
Replies
1
Views
1K
Replies
7
Views
23K
  • Posted
Replies
3
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top