Solving the case of diluting concentrated sulfuric acid with water and with dilute acid
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The last edit to this post was made by Benmo Daodi on 2017-7-10 at 10:35. The question is: when diluting 98% concentrated sulfuric acid, does using water for dilution produce more heat, or does using 10% dilute sulfuric acid for dilution produce more heat?
Of course, concentrated sulfuric acid releases more heat. Moreover, water should not be added directly to concentrated sulfuric acid; instead, concentrated sulfuric acid should be added to water, and the order must not be reversed.
These are two ways of dilution; which one releases more heat depends not on the order in which water and acid are added
Didn’t I say that concentrated sulfuric acid releases a lot of heat?
Using water to dilute it results in more heat release. There is a table regarding the heat release upon dilution with sulfuric acid, showing how much heat is released at each concentration level; you can look it up.
The heat release of the two methods is the same. Since it is prepared using dilute acid, the total volume is larger; therefore, the preparation temperature is also lower than that when using water.