Heat of reaction

  • Thread starter msdel
  • Start date
  • #1
msdel
5
0
I conducted an expereiment where I added 5.5g of NaOH into 200ml of 1.0 mol/l of HCl. I've done all the calculations required but there is a questoin I am 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
 

Answers and Replies

  • #2
gravenewworld
1,127
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:
  • #3
LeonhardEuler
Gold Member
860
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.
 

Suggested for: Heat of reaction

  • Last Post
Replies
8
Views
615
Replies
3
Views
630
  • Last Post
Replies
5
Views
553
  • Last Post
Replies
13
Views
552
Replies
3
Views
304
Replies
8
Views
967
Replies
2
Views
1K
Replies
11
Views
224
Top