Ruwan Zinare
Abubuwan da ake samu a shirye - kowane gishiri mai narkewa na gubar da potassium iodide - zai ba da izinin gwaji mai ban sha'awa. Duk da haka, yayin gwajin, dole ne mu tuna don yin hankali musamman lokacin aiki tare da mahadi masu gubar gubar. Yayin gwajin, ba ma ci ko sha, kuma bayan aikin, muna wanke hannayenmu da kayan gilashin a hankali. Bugu da ƙari, shawara ce ta dindindin ga masanin kimiyyar gwaji.
Bari mu shirya waɗannan reagents: gishiri mai narkewa sosai na gubar (II) - nitrate (V) Pb (NO)3)2 ko acetate (CH3Babban jami'in gudanarwa)2Pb- da potassium iodide KI. Muna shirya mafita daga gare su tare da maida hankali har zuwa 10%. Ana zuba maganin gishirin gubar a cikin filas ɗin, sannan a ƙara ƙaramin ƙarar maganin KI. Bayan ya motsa ruwan nan da nan ya samar da ruwan rawaya na gubar (II) iodide PbI.2 (hoto 1):
Pb2+ + 2 I- → PbI2↓
Guji wuce haddi potassium iodide bayani, kamar yadda hazo narke a mafi girma yawa na iodide ions (complex fili K).2[PbI4]).
Ruwan ruwan rawaya ya fi narkewa a cikin ruwan zafi. Bayan sanya flask ɗin a cikin wani babban jirgin ruwa na tafasasshen ruwa (ko dumama shi a kan harshen wuta), ba da daɗewa ba hazo ya ɓace kuma mara launi.hoto 2) ko kawai bayani mai launin rawaya kaɗan. Yayin da flask ɗin ya yi sanyi, lu'ulu'u sun fara bayyana a cikin nau'i na plaques na zinariya (hoto 3). Wannan shine tasirin jinkirin crystallization na gubar (II) iodide, wanda ya haifar da ƙananan solubility na gishiri a cikin mai sanyaya. Idan muka motsa abin da ke cikin flask ɗin kuma muka haskaka jirgin daga gefe, za mu ga sunan "ruwan zinariya" (nemo bayanin wannan kwarewa a Intanet a ƙarƙashin wannan sunan). Sakamakon gwajin kuma yayi kama da dusar ƙanƙara ta hunturu tare da sabon abu - zinariya - petals (hoto 4 da 5).
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