25- lab mashg’uloti. 12-guruh elementlari. Rux, kadmiy va simob birikmalari. Laboratoriya ishining maqsadi

9-tajriba. Silikat kislotaning olinishi
Probirkaga 8-10 tomchi natriy silikat eritmasidan solib, unga Kiрp apparatidan uglerod (IV) oksid yuboring. Silikat kislota hosil bo‘lishini kuzating. Reaksiya tenglamasini yozib, H₂SiO₃ va H₂CO₃ qaysi biri kuchliroq elektrolit ekanligini
elektrolitlarning dissotsiatsiya konstantasiga asoslanib aniqlang.
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10-tajriba. Silikat kislota tuzlarining gidrolizi
Probirkaga 4-5 tomchi natriy silikat eritmasidan solib, bir tomchi fenolftalein eritmasidan tomizing. Indikator rangining o‘zgarishini kuzatib, Na₂SiO₃ ning gidroliz tenglamasini molekulyar va ionli shaklda yozing.
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11-tajriba. Natriy silikatning ammoniy xlorid ishtirokida gidrolizi
Natriy silikatning 5-6 tomchi eritmasiga shuncha hajmda ammoniy xlorid eritmasidan qo‘shib, aralashmani shisha tayoqcha bilan aralashtiring. Silikat kislotaning hosil bo‘lishini va ammiak ajralib chiqishini kuzating. Ammiak ajralib chiqishini qanday bilish mumkin? Reaksiya tenglamasini molekulyar va ionli shaklda yozing.
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