http://tw.knowledge.yahoo.com/question/question?qid=1012020805820

將鹽酸加水是放熱麻

答:鹽酸加水,是酸的稀釋為放熱反應.
最好是將鹽酸倒入水中,而不是鹽酸加水.
強酸稀釋會釋放熱量,溫度會上升,故為放熱反應....
如果是濃硫酸 加水,水會濺射會有危險
應該是將濃硫酸慢慢倒入水中 ,硫酸稀釋也是放熱反應 .

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Posted 02 February 2012 - 06:24 AM


Heat of Solution for 1kg HCl:

acid concentration
[weight-%]

0.1%

 485 kcal
25%

 427 kcal
30%

 408 kcal
35%

 392 kcal
40%

 374 kcal


 dilute 'X kg' of 35% [by w/w %] HCl solution to get 28% [by w/w %] 200kg HCl


 200 kg of 35% = 70 kg HCL , during the dilution with water will generate 70*( 420-392) kcal #2100 kcal