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شیمی و آزمایشگاه شیمی - شناسایی عناصر در ترکیبات آلی (تجزیه کیفی مواد آلی (۴) شناسایی گوگرد

شناسایی عناصر در ترکیبات آلی (تجزیه کیفی مواد آلی (۴) شناسایی گوگرد

نویسنده :Minaeifar
تاریخ:سه شنبه 1 آبان 1386-11:10 ق.ظ

شناسایی عناصر در ترکیبات آلی (تجزیه کیفی مواد آلی به روش ذوب قلیایی جهت تشخیص ازت، گوگرد و هالوژنها)

4- شناسایی گوگرد 

الف) استفاده از استات سرب: در حدود 1 میلی لیتر محلول زیر صافی حاصل از ذوب قلیایی را در یک لوله آزمایش ریخته و با استیک اسید، اسیدی کنید. حال به محلول حاصل چند قطره استات سرب اضافه کنید. ایجاد رسوب سیاه رنگ سولفید سرب دلیل بر وجود گوگرد در ماده آلی است.

ب) استفاده از پلمبیت سدیم: در حدود 1 میلی لیتر محلول زیر صافی حاصل از ذوب قلیایی را در یک لوله آزمایش ریخته و حدود یک میلی لیتر محلول پلمبیت سدیم به آن اضافه کنید. تشکیل رسوب سیاه رنگ PbS نشانه وجود گوگرد در جسم مورد آزمایش است.




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