اختبار لهب الصوديوم
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تعرف على الصوديوم من خلال لهبه الأصفر الساطع
الهدف
لاحظ اللهب الأصفر الساطع المميز الناتج عند تسخين مركبات الصوديوم، مما يوضح كيف تنتج أيونات المعادن ألوان لهب محددة.
الخلفية
The sodium flame test is one of the simplest and most dramatic qualitative analysis techniques. When sodium ions are introduced into a flame, the thermal energy excites the 3s valence electron to the 3p orbital. As the electron returns to the ground state, it emits light at 589 nm, producing an intense and persistent yellow-orange color. This is the same emission responsible for the yellow color of sodium vapor street lamps.
تحذيرات السلامة
- Wear safety goggles at all times
- Keep hair tied back near open flames
- Handle HCl with care — avoid skin contact
- Ensure proper ventilation
معدات الوقاية الشخصية المطلوبة
المواد
-
Sodium chloride (NaCl) (1 g)Table salt works
-
Hydrochloric acid (HCl) (10 mL)1M concentration
-
Distilled water (50 mL)For cleaning
المعدات
الإجراء
Clean the nichrome wire by dipping it in 1M HCl and holding it in the hottest part of the Bunsen burner flame. Repeat until no color appears in the flame.
Place a small amount of sodium chloride on the watch glass.
Dip the clean nichrome wire into the HCl, then into the sodium chloride sample to pick up a small amount.
Hold the wire loop with the sample at the edge of the Bunsen burner flame and observe the flame color.
Record the flame color observed. Note the intensity and persistence of the color.
Clean the wire again with HCl and repeat to confirm results.
النتائج المتوقعة
A bright, persistent yellow-orange flame should appear immediately when the sodium chloride is introduced to the flame. The color is so intense that it can mask the colors of other metal ions present.
التنظيف
Clean the nichrome wire loop thoroughly with HCl. Dispose of remaining chemicals according to lab protocols. Wipe down the work area.
التفاصيل
- الفئة
- Flame Tests
- الصعوبة
- Beginner (Middle School)
- المدة
- 15 دقيقة
- التكلفة التقديرية
- $5,00
- الخطوات
- 6
- المواد
- 3