التبلور الجزئي للملح والرمل

فصل خليط باستخدام فروق الذوبانية

Crystallization Beginner (Middle School) 35 دقيقة ~$3,00

الهدف

فصل خليط ملح ورمل باستخدام التبلور الجزئي، مما يوضح الإذابة والترشيح والتبلور بالتبخر.

الخلفية

This classic separation technique exploits the fact that salt dissolves in water while sand does not. The mixture is dissolved in hot water, filtered to remove sand, and then the salt is recovered by evaporation. This is fundamentally how salt has been harvested from seawater for millennia.

تحذيرات السلامة

  • Handle hot evaporating dish with tongs
  • Do not heat to dryness too rapidly — spattering risk

معدات الوقاية الشخصية المطلوبة

goggles

المواد

  • Salt-sand mixture (10 g)
    Pre-mixed approximately 50:50
  • Distilled water (100 mL)

المعدات

250 mL beaker Filter paper Funnel Evaporating dish Hot plate Stirring rod Analytical balance

الإجراء

1

Weigh 10 g of the salt-sand mixture and record the mass.

2 دقيقة
2

Add the mixture to 100 mL of warm water in the beaker. Stir for 5 minutes to dissolve all the salt.

5 دقيقة
3

Filter the mixture through filter paper. The sand remains on the filter; the salt solution passes through.

5 دقيقة
4

Rinse the sand on the filter with a small amount of distilled water. Dry the sand and weigh it.

5 دقيقة
5

Pour the filtrate into the evaporating dish. Heat gently on the hot plate to evaporate the water.

12 دقيقة Remove from heat before completely dry
6

Once dry, weigh the recovered salt. Calculate the percentage of each component.

3 دقيقة
7

Compare the total recovered mass with the initial mass. Calculate percent recovery.

3 دقيقة

النتائج المتوقعة

The total mass of recovered salt + sand should be close to the original 10 g (typically 90-98% recovery). Some loss occurs during transfer and on filter paper. The separated components should be visually distinct.

التنظيف

Salt solution can go down the drain. Sand can go in the trash. Rinse all glassware.

التفاصيل

الفئة
Crystallization
الصعوبة
Beginner (Middle School)
المدة
35 دقيقة
التكلفة التقديرية
$3,00
الخطوات
7
المواد
2

مزيد من التجارب

إعادة تبلور حمض البنزويك 45 min التشبع الفائق والتبلور الفوري 35 min تبلور السالول (فينيل ساليسيلات) 30 min حلوى صخرة بلورات السكر 25 min زراعة بلورات الشب 30 min زراعة بلورات بزموت قوس قزح 45 min زراعة بلورات كبريتات النحاس 30 min

Frequently Asked Questions

What is the objective of التبلور الجزئي للملح والرمل?
فصل خليط ملح ورمل باستخدام التبلور الجزئي، مما يوضح الإذابة والترشيح والتبلور بالتبخر.
How difficult is التبلور الجزئي للملح والرمل?
This experiment is rated as Beginner (Middle School). It takes approximately 35 minutes to complete.
What safety precautions are needed for التبلور الجزئي للملح والرمل?
Key safety precautions include: Handle hot evaporating dish with tongs; Do not heat to dryness too rapidly — spattering risk.
What materials are needed for التبلور الجزئي للملح والرمل?
The main materials required are: Salt-sand mixture, Distilled water.
What results should I expect from التبلور الجزئي للملح والرمل?
The total mass of recovered salt + sand should be close to the original 10 g (typically 90-98% recovery). Some loss occurs during transfer and on filter paper. The separated components should be visually distinct.