Titrasi Iodometrik Pemutih

Menentukan konsentrasi natrium hipoklorit dalam pemutih rumah tangga

Titrations Advanced (University) 50 menit ~$15,00

Tujuan

Tentukan konsentrasi natrium hipoklorit (NaOCl) dalam pemutih komersial menggunakan titrasi iodometrik dengan natrium tiosulfat.

Latar Belakang

In iodometric titrations, the analyte (hypochlorite) oxidizes iodide ions to iodine, which is then titrated with sodium thiosulfate. The endpoint is detected using starch indicator. This indirect method is widely used for determining the concentration of oxidizing agents.

Peringatan Keselamatan

  • Bleach is an irritant and oxidizer
  • Do not mix bleach with acid in large quantities — produces chlorine gas
  • Work in a well-ventilated area or fume hood
  • Wear safety goggles and gloves

APD yang Diperlukan

goggles gloves lab_coat

Bahan

  • Household bleach (50 mL)
    Dilute 1:10 before use
  • Potassium iodide (KI) (5 g)
    Excess
  • Sodium thiosulfate (Na₂S₂O₃) (100 mL)
    0.1M standardized
  • Starch indicator (10 mL)
    1% solution
  • Acetic acid (CH₃COOH) (20 mL)
    2M
  • Distilled water (300 mL)

Peralatan

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

Prosedur

1

Prepare a 1:10 dilution of the bleach with distilled water in the volumetric flask.

3 menit Bleach is irritating
2

Pipette 25.0 mL of the diluted bleach into the Erlenmeyer flask.

2 menit
3

Add approximately 2 g of potassium iodide. The solution will turn brown/yellow as iodine is liberated.

2 menit
4

Add 10 mL of 2M acetic acid to acidify the solution.

1 menit Work in ventilated area
5

Fill the burette with 0.1M sodium thiosulfate. Begin titrating the brown iodine solution.

5 menit
6

When the solution becomes pale yellow, add 1 mL of starch indicator. The solution turns dark blue.

2 menit
7

Continue titrating drop by drop until the blue color disappears and the solution becomes colorless.

5 menit
8

Record the volume. Repeat for concordant results. Calculate the NaOCl concentration accounting for the dilution.

15 menit

Hasil yang Diharapkan

Household bleach typically contains 3-8% NaOCl. The endpoint should show a sharp transition from blue to colorless. Multiple concordant results should agree within 0.10 mL.

Pembersihan

Neutralize iodine waste with sodium thiosulfate before disposal. Rinse all glassware. Ensure proper ventilation during cleanup.

Detail

Kategori
Titrations
Tingkat Kesulitan
Advanced (University)
Durasi
50 menit
Perkiraan Biaya
$15,00
Langkah
8
Bahan
6

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Frequently Asked Questions

What is the objective of Titrasi Iodometrik Pemutih?
Tentukan konsentrasi natrium hipoklorit (NaOCl) dalam pemutih komersial menggunakan titrasi iodometrik dengan natrium tiosulfat.
How difficult is Titrasi Iodometrik Pemutih?
This experiment is rated as Advanced (University). It takes approximately 50 minutes to complete.
What safety precautions are needed for Titrasi Iodometrik Pemutih?
Key safety precautions include: Bleach is an irritant and oxidizer; Do not mix bleach with acid in large quantities — produces chlorine gas; Work in a well-ventilated area or fume hood.
What materials are needed for Titrasi Iodometrik Pemutih?
The main materials required are: Household bleach, Potassium iodide (KI), Sodium thiosulfate (Na₂S₂O₃), Starch indicator, Acetic acid (CH₃COOH).
What results should I expect from Titrasi Iodometrik Pemutih?
Household bleach typically contains 3-8% NaOCl. The endpoint should show a sharp transition from blue to colorless. Multiple concordant results should agree within 0.10 mL.