Timeline for False positive test for chloride ions during lab practical
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 19 at 10:46 | vote | accept | Gaurav Sai Maddipati | ||
| Jan 19 at 10:46 | |||||
| Jan 19 at 9:32 | comment | added | Maurice | The reaction proceeds according to H2SO4 + NaCl -> NaHSO4 + HCl and not in the reverse direction, because HCl is the most volatile substance, and gets first out of the mixture, especially when heating a bit. This behavior has nothing to do with potentials, as the oxidation numbers of the atoms do not change during the reaction. | |
| Jan 18 at 17:08 | comment | added | Gaurav Sai Maddipati | Why does the reaction proceed in the reverse direction? Does it have anything to do with electrode potentials? | |
| Jan 18 at 17:05 | comment | added | Gaurav Sai Maddipati | No, I don't remember seeing brownish fumes, it was mostly white/offwhite. Its probably just my inexperience and I should've done the test again, but unfortunately in the exam writing matters more than performing. | |
| Jan 18 at 17:02 | comment | added | Gaurav Sai Maddipati | Thank you for the answer. Actually, the manual recommends concentrated H2SO4 but i doubt the one provided is very concentrated hence the 'mildly'. | |
| Jan 18 at 16:36 | history | answered | Maurice | CC BY-SA 4.0 |