Çöktürme Titrasyonu (Mohr Yöntemi)

Gümüş nitrat kullanarak klorür konsantrasyonunu belirleme

Titrations Advanced (University) 45 dak ~$20,00

Hedef

Mohr yöntemini kullanarak bir çözeltideki klorür iyonu konsantrasyonunu belirlemek; gümüş nitrat titrant, potasyum kromat ise indikatör olarak kullanılır.

Arka Plan

In the Mohr method, silver nitrate reacts with chloride ions to form white silver chloride precipitate. When all chloride is consumed, the first excess silver reacts with the chromate indicator to form brick-red silver chromate, signaling the endpoint. This method works at near-neutral pH.

Güvenlik Uyarıları

  • Silver nitrate stains skin and clothing permanently
  • Potassium chromate is toxic and a suspected carcinogen — handle with extreme care
  • Wear nitrile gloves and safety goggles
  • Dispose of silver and chromate waste in designated containers

Gerekli KKD

goggles gloves lab_coat

Malzemeler

  • Sodium chloride solution (100 mL)
    Unknown concentration
  • Silver nitrate (AgNO₃) (100 mL)
    0.1M standardized
  • Potassium chromate (K₂CrO₄) (10 mL)
    5% indicator solution
  • Distilled water (200 mL)

Ekipman

50 mL burette Burette stand and clamp 250 mL Erlenmeyer flask 25 mL pipette White tile

Prosedür

1

Pipette 25.0 mL of the chloride solution into the Erlenmeyer flask.

2 dak
2

Add 1 mL of 5% potassium chromate indicator. The solution turns pale yellow.

1 dak Chromate is toxic — use minimal amount
3

Fill the burette with 0.1M AgNO₃. Record the initial volume.

3 dak AgNO₃ stains permanently
4

Titrate while swirling vigorously. A white precipitate of AgCl forms.

10 dak
5

Near the endpoint, the precipitate becomes more curd-like. Add AgNO₃ drop by drop until a permanent brick-red color of Ag₂CrO₄ appears.

5 dak
6

Record the volume. Repeat for concordant results.

15 dak
7

Calculate chloride concentration: C(Cl⁻) = C(Ag+) x V(AgNO₃) / V(sample).

5 dak

Beklenen Sonuçlar

The endpoint is marked by the first permanent appearance of a brick-red color due to Ag₂CrO₄ formation. This color should persist for at least 30 seconds after swirling.

Temizlik

Collect all silver-containing waste in the designated heavy metal waste container. Collect chromate waste separately. Never dispose down the drain. Wash hands thoroughly.

Ayrıntılar

Kategori
Titrations
Zorluk
Advanced (University)
Süre
45 dak
Tahmini Maliyet
$20,00
Adımlar
7
Malzemeler
4

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Frequently Asked Questions

What is the objective of Çöktürme Titrasyonu (Mohr Yöntemi)?
Mohr yöntemini kullanarak bir çözeltideki klorür iyonu konsantrasyonunu belirlemek; gümüş nitrat titrant, potasyum kromat ise indikatör olarak kullanılır.
How difficult is Çöktürme Titrasyonu (Mohr Yöntemi)?
This experiment is rated as Advanced (University). It takes approximately 45 minutes to complete.
What safety precautions are needed for Çöktürme Titrasyonu (Mohr Yöntemi)?
Key safety precautions include: Silver nitrate stains skin and clothing permanently; Potassium chromate is toxic and a suspected carcinogen — handle with extreme care; Wear nitrile gloves and safety goggles.
What materials are needed for Çöktürme Titrasyonu (Mohr Yöntemi)?
The main materials required are: Sodium chloride solution, Silver nitrate (AgNO₃), Potassium chromate (K₂CrO₄), Distilled water.
What results should I expect from Çöktürme Titrasyonu (Mohr Yöntemi)?
The endpoint is marked by the first permanent appearance of a brick-red color due to Ag₂CrO₄ formation. This color should persist for at least 30 seconds after swirling.