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scan0005 - Q 2.15 Did the sniff test or the litmus test...

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Unformatted text preview: Q 2.15 Did the sniff test or the litmus test prove to be more sensitive for the detection of NH ? Respond based on your results. 9901—. Nl—hgi'M/LW W cm M50 who Q 2.16 Based on work done in section 3., devise and perform a test for NH 4+ based on its conversion to N H3. Note: Any reaction employed can be accelerated by gentle heating. Imagine that you begin with a solid sample. Then give a detailed account of your test including a description of all pertinent observations and results. Nth: + 1430mm: vigor (a NH? M. a , a eager-amt. 1:»ng SM Nqu West mi mwfgca NH; Mamaweema Lama“ ”Wu . ,E , Volatility of NH: compounds. Placea small (about pea sized) portion of NH 4Cl(s) N H4 in an open crucible. Place the crucible in a clay triangle supported by an iron ring clamped to aring stand. Place the assembly in the hood and heat the crucible strongly with the bumegr flame until fumes and smoke are no longer discharged. Reobserve crucible contents. Q 2.17 What evidence has been obtained to support the conclusion that compounds of NH: may be completely volatilized? WWW-56 Nita mad. Repeat the above investigation, but this time begin with a mixture of NH 4Cl(s) and KCl(s). After ignition, test any residue for NH4+ and K. Do no_t use a flame test for K. Do 11_ot add liquids to ah_0t crucible. First allow the crucible to cool and then dissolve any residue to be tested for K with no more than 1— 2 mL deionized water. Q 2.18 Report your method and result for the NH4 + test. @fi-‘W 01W cal-lack, NHLt 4’th 3 “H @mWagh-{Cl- 2-13 ...
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