Kimyo bakalavr) 2021-2022 o’quv yili I semester uchun II kurs (III semestr) namangan – 2021

Lаbоrаtоriya-8

IV, V, VI guruh kаtiоnlаri аrаlаshmаsi аnаlizi
Tekshiriluvchi eritmaga aralashtirib turgan xolatda tomchilab 2 mol/dm³ NaOH eritmasidan neytral sharoit xosil bo’lguncha qo’shiladi. 1,5 baravar xajmda yana NaOH xamda 7-8 tomchi 3% H₂O₂ tomiziladi va suv xammomida isitiladi. V va VI gurux kationlari gidroksid (oksid asosli tuz) xolatda cho’kmaga tushadi. IV gurux kationlari eritmada qoladi.
V va VI gurux kationlarining gidroksidlarini ajratish

Yangi xosil bo’lgan cho’kmani (V va VI gurux) ortiqcha 25%li ammiak eritmasi, shisha tayoqcha yordamida aralashtirib, 2-3 min suv xammomida isitiladi. VI gurux kationlari gidroksid xolatida qoladi. Aralashma sentrifugalanadi. Cho’kma va eritma rangiga e’tibor bering. Cho’kma taxlil qilinadi, sentrifugalanib, saqlab qo’yiladi.

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