File:Lead(II) iodide crystals grown in silica gel.JPG

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English: A mixture of acetic acid, lead(II) acetate and sodium silicate solutions was poured into a large test tube, and left to rest until a gel was formed. After that potassium iodide solution was poured onto the surface of the gel. Yellow lead(II) iodide precipitate formed immediately on the gel's surface. After a day yellow crystals appeared in the gel. Slowly, the iodide ions migrated into the gel and reacted with the lead(II) ions trapped in the gel thus forming small spectacular lead(II) iodide crystals. The formation of the bright yellow crystals lasts for days. It is clearly visible that the spatial arrangement of the crystals initially very tight, but eventually loosens as iodide ions has to diffuse into the deepest reaches of the gel. Two crystal forms are prevalent: fern-like shapes and hexagonal platelets.
Magyar: Ecetsav, ólom(II)-acetát és nátrium-szilikát oldatait kevertem össze, majd öntöttem egy nagy kémcsőbe. A keveréket pihentettem, amíg gél keletkezett belőlük. Ezután kálium-jodid-oldatot öntöttem a gél felszínére. Azonnal sárga ólom(II)-jodid csapadék keletkezett a gél felszínén. Egy nap múlva sárga kristályok jelentek meg a gélben. A jodidionok lassacskán a gélbe vándoroltak, ahol reagáltak az ólom(II)-ionokkal, ezáltal pedig apró, de látványos ólom(II)-jodid kristályokat hoztak létre. A ragyogó sárga kristályok keletkezése napokig tart. Jól látható, hogy a kristályok térbeli elhelyezkedése eleinte szoros, de idővel lazábbá válik, ahogy a jodidionok messzebbre vándorolnak a gél mélyébe. Két kristályforma az uralkodó: a páfrányszerűek és a hatszöges lemezkék.
English: Lead(II) iodide crystals grown in silica gel
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Author Sjtanarur

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current22:38, 30 November 2015Thumbnail for version as of 22:38, 30 November 20154,000 × 3,000 (2.37 MB)Sjtanarur (talk | contribs)User created page with UploadWizard

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