नमक और रेत का खंडित क्रिस्टलीकरण

घुलनशीलता अंतर का उपयोग करके मिश्रण को अलग करना

Crystallization Beginner (Middle School) 35 मिनट ~$3.00

उद्देश्य

विघटन, निस्पंदन और वाष्पीकरणीय क्रिस्टलीकरण प्रदर्शित करते हुए, खंडित क्रिस्टलीकरण का उपयोग करके नमक और रेत के मिश्रण को अलग करें।

पृष्ठभूमि

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.

सुरक्षा चेतावनियाँ

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

आवश्यक PPE

goggles

सामग्री

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

उपकरण

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

प्रक्रिया

1

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

2 मिनट
2

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

5 मिनट
3

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

5 मिनट
4

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

5 मिनट
5

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

12 मिनट Remove from heat before completely dry
6

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

3 मिनट
7

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

3 मिनट

अपेक्षित परिणाम

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.

सफाई

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

विवरण

श्रेणी
Crystallization
कठिनाई
Beginner (Middle School)
अवधि
35 मिनट
अनुमानित लागत
$3.00
चरण
7
सामग्री
2

अधिक प्रयोग

अतिसंतृप्ति और तात्कालिक क्रिस्टलीकरण 35 min कॉपर सल्फेट क्रिस्टल उगाना 30 min चीनी क्रिस्टल रॉक कैंडी 25 min फिटकरी क्रिस्टल उगाना 30 min बिस्मथ इंद्रधनुष क्रिस्टल उगाना 45 min बेंजोइक अम्ल का पुनःक्रिस्टलीकरण 45 min सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण 30 min

Frequently Asked Questions

What is the objective of नमक और रेत का खंडित क्रिस्टलीकरण?
विघटन, निस्पंदन और वाष्पीकरणीय क्रिस्टलीकरण प्रदर्शित करते हुए, खंडित क्रिस्टलीकरण का उपयोग करके नमक और रेत के मिश्रण को अलग करें।
How difficult is नमक और रेत का खंडित क्रिस्टलीकरण?
This experiment is rated as Beginner (Middle School). It takes approximately 35 minutes to complete.
What safety precautions are needed for नमक और रेत का खंडित क्रिस्टलीकरण?
Key safety precautions include: Handle hot evaporating dish with tongs; Do not heat to dryness too rapidly — spattering risk.
What materials are needed for नमक और रेत का खंडित क्रिस्टलीकरण?
The main materials required are: Salt-sand mixture, Distilled water.
What results should I expect from नमक और रेत का खंडित क्रिस्टलीकरण?
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.