4 replies to this topic

[Nick (6 Engineering Ltd)]

Dear All,
I need to find out heats of reaction (in order to calculate temperatures) for the following reactions:
H2SO4 with water
NaOH with water
Does anybody either have this info or know where I can find it?
Thanks in advance,
Nick

[mbeychok]

Jellybean:

I think what you want is the heat of dilution. The web site given below has a graph of the heat of dilution for H2SO4 (in Btu per pound of H2SO4 versus the weight percent of H2SO4 in the resulting solution):

www.resistoflex.com/sulfuric_graphs.htm#5

I would suggest you do a Google search to find similar data for the heat of dilution of sodium hydroxide.

[siretb]

I have a graph, that comes from "selected values of Chemical Thermodynamics Properties", US department of commerce, 1952, page 449
I do not use it (I have a software package), but if it may help here are a few points starting with 25°C water

heat released (calories per gram of NaOH), versus final concentration ( in g/100g of solution), during dilution.

I hope this helps.

0 (g/100g) 255 (cal/gram NaOH) / 15 255 / 20 250 / 30 230 / 35 208 / 40 196

[gvdlans]

Handbook of Chemistry and Physics, 67th edition, page D-122.
Heat of Solution for NaOH at 25°C in water: -10,637 cal/mole

[Nick (6 Engineering Ltd)]

Thank You all very much for your replies
Much appreciated
Nick