مختبر مقارنة اختبار اللهب

اختبار معادن متعددة لبناء مخطط مرجعي لألوان اللهب

Flame Tests Intermediate (High School) 45 دقيقة ~$25,00

الهدف

أجرِ اختبارات اللهب على ستة أملاح معدنية مختلفة لإنشاء مخطط مرجعي لألوان اللهب المميزة للتحليل النوعي.

الخلفية

This comprehensive flame test lab tests multiple metal salts side by side, building a reference chart that students can use for unknown identification. By comparing the flame colors of lithium, sodium, potassium, calcium, strontium, and copper directly, students develop the observational skills needed for qualitative chemical analysis.

تحذيرات السلامة

  • Wear safety goggles at all times
  • Wear gloves when handling copper chloride
  • Handle HCl with care — avoid contact with skin
  • Keep hair tied back near open flames
  • Clean wire between each test to prevent cross-contamination

معدات الوقاية الشخصية المطلوبة

goggles gloves lab_coat

المواد

  • Lithium chloride (LiCl) (0.5 g)
  • Sodium chloride (NaCl) (0.5 g)
  • Potassium chloride (KCl) (0.5 g)
  • Calcium chloride (CaCl₂) (0.5 g)
  • Strontium chloride (SrCl₂) (0.5 g)
  • Copper(II) chloride (CuCl₂) (0.5 g)
    Toxic
  • Hydrochloric acid (HCl) (50 mL)
    1M concentration
  • Cobalt blue glass (1 piece)
    For potassium identification

المعدات

Bunsen burner Nichrome wire loop 6 labeled watch glasses Forceps Lab notebook

الإجراء

1

Prepare six labeled watch glasses, each containing a small amount of one metal salt.

3 دقيقة Wear gloves for copper chloride
2

Clean the nichrome wire thoroughly by repeatedly dipping in HCl and heating until the flame shows no color.

3 دقيقة
3

Test lithium chloride first. Dip wire in HCl, then into the salt, and hold in the flame. Record the crimson-red color.

3 دقيقة
4

Clean the wire thoroughly. Test sodium chloride and record the bright yellow flame.

3 دقيقة
5

Clean the wire. Test potassium chloride. Observe with naked eye, then through cobalt blue glass. Record the lilac/violet color.

4 دقيقة
6

Clean the wire. Test calcium chloride and record the orange-red flame.

3 دقيقة
7

Clean the wire. Test strontium chloride and record the scarlet-red flame.

3 دقيقة
8

Clean the wire. Test copper(II) chloride and record the blue-green flame.

3 دقيقة
9

Create a complete reference chart organizing the metals by flame color from red through yellow to green and violet.

5 دقيقة

النتائج المتوقعة

A complete flame color reference chart: Li (crimson-red), Sr (scarlet-red), Ca (orange-red), Na (yellow), Ba (yellow-green if tested), Cu (blue-green), K (lilac/violet through cobalt glass). Each color should be distinguishable from the others.

التنظيف

Clean the wire with HCl. Dispose of copper waste in the heavy metal waste container. Dispose of remaining salts per lab protocol. Clean and dry all watch glasses.

التفاصيل

الفئة
Flame Tests
الصعوبة
Intermediate (High School)
المدة
45 دقيقة
التكلفة التقديرية
$25,00
الخطوات
9
المواد
8

مزيد من التجارب

اختبار لهب الباريوم 20 min اختبار لهب البوتاسيوم 20 min اختبار لهب السترونشيوم 15 min اختبار لهب الصوديوم 15 min اختبار لهب الكالسيوم 15 min اختبار لهب الليثيوم 15 min اختبار لهب النحاس 15 min

Frequently Asked Questions

What is the objective of مختبر مقارنة اختبار اللهب?
أجرِ اختبارات اللهب على ستة أملاح معدنية مختلفة لإنشاء مخطط مرجعي لألوان اللهب المميزة للتحليل النوعي.
How difficult is مختبر مقارنة اختبار اللهب?
This experiment is rated as Intermediate (High School). It takes approximately 45 minutes to complete.
What safety precautions are needed for مختبر مقارنة اختبار اللهب?
Key safety precautions include: Wear safety goggles at all times; Wear gloves when handling copper chloride; Handle HCl with care — avoid contact with skin.
What materials are needed for مختبر مقارنة اختبار اللهب?
The main materials required are: Lithium chloride (LiCl), Sodium chloride (NaCl), Potassium chloride (KCl), Calcium chloride (CaCl₂), Strontium chloride (SrCl₂).
What results should I expect from مختبر مقارنة اختبار اللهب?
A complete flame color reference chart: Li (crimson-red), Sr (scarlet-red), Ca (orange-red), Na (yellow), Ba (yellow-green if tested), Cu (blue-green), K (lilac/violet through cobalt glass). Each color should be distinguishable from the others.