Timeline for Why add water first then acid?
Current License: CC BY-SA 3.0
8 events
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| Nov 11, 2020 at 19:10 | comment | added | Alchimista | @DmitryGrigoryev Also, in general, the heat of reaction depends on the actual molar ratio. There is no a priori reason to expect a symmetry. I find this a satisfactory answer, tough it should be combined with those by permeakra and by Matt. | |
| Jun 1, 2019 at 3:35 | comment | added | BeowulfNode42 | @DmitryGrigoryev while I'm no expert chemist, I think that the first drop of acid in to water dilutes quickly, such that there is no longer a strong acid present, and the rate of reaction is slowed. The other way around, it takes many drops of water added to a strong acid to dilute it enough to slow the reaction, so all of that initial water added to the acid reacts strongly, producing a lot of heat quickly. I think the same amount of total heating occurs either way, just the speed is different. I think the first 2 paragraphs of Matt's answer says something similar, but with more science. | |
| Mar 26, 2018 at 8:10 | comment | added | Dmitry Grigoryev | The same argument could be made about the first drop of acid. | |
| May 27, 2017 at 0:41 | review | Suggested edits | |||
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| Dec 4, 2015 at 21:08 | history | edited | Jan | CC BY-SA 3.0 |
Added MathJax and removed clutter.
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| Sep 28, 2012 at 1:57 | review | Suggested edits | |||
| Sep 28, 2012 at 2:21 | |||||
| Aug 5, 2012 at 17:36 | history | edited | user467 | CC BY-SA 3.0 |
Fixed incorrect comment
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| Aug 3, 2012 at 23:02 | history | answered | user467 | CC BY-SA 3.0 |