التحقق من سلسلة النشاط
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اختبار تفاعلية المعادن بتفاعلات الإحلال
الهدف
التحقق من سلسلة النشاط الكيميائي الكهربائي باختبار ما إذا كانت المعادن قادرة على إحلال معادن أخرى من محلول.
الخلفية
A more reactive (more easily oxidized) metal will displace a less reactive metal from its salt solution. By testing multiple combinations, students can experimentally construct the activity series: Zn > Fe > Cu > Ag.
تحذيرات السلامة
- Silver nitrate stains skin permanently
- Copper sulfate is toxic
- Wear gloves when handling solutions
معدات الوقاية الشخصية المطلوبة
المواد
-
Zinc strips (3 pieces)Small pieces
-
Iron nails (3)Clean steel nails
-
Copper strips (3 pieces)
-
Copper(II) sulfate solution (50 mL)0.1M
-
Iron(II) sulfate solution (50 mL)0.1M
-
Zinc sulfate solution (50 mL)0.1M
-
Silver nitrate solution (30 mL)0.1M
المعدات
الإجراء
Sand all metal pieces until shiny to remove oxide layers.
Place 10 mL of each metal salt solution into labeled test tubes. You need: CuSO₄, FeSO₄, ZnSO₄, and AgNO₃.
Test zinc in CuSO₄ solution. Observe for 5 minutes and record changes on the metal and in the solution.
Test iron in CuSO₄ solution. Observe and record.
Test copper in ZnSO₄ solution. Observe and record (expect no reaction).
Test copper in AgNO₃ solution. Observe silver crystals forming on the copper.
Compile results into a reactivity table and rank the metals from most to least reactive.
النتائج المتوقعة
Zinc displaces copper (blue solution fades, copper deposits on zinc). Iron displaces copper (blue fades slower). Copper does not displace zinc. Copper displaces silver (silver crystals grow). Order: Zn > Fe > Cu > Ag.
التنظيف
Collect silver waste separately in heavy metal container. Dispose of copper waste properly. Rinse metal pieces and test tubes.
التفاصيل
- الفئة
- Electrochemistry
- الصعوبة
- Beginner (Middle School)
- المدة
- 30 دقيقة
- التكلفة التقديرية
- $12,00
- الخطوات
- 7
- المواد
- 7