Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat

Menggunakan dua indikator untuk menganalisis campuran karbonat

Titrations Advanced (University) 55 menit ~$14,00

Tujuan

Analisis campuran natrium karbonat dan natrium bikarbonat dengan menitrasinya dengan HCl menggunakan dua indikator secara berurutan: fenolftalein dan metil oranye.

Latar Belakang

A mixture of Na₂CO₃ and NaHCO₃ has two equivalence points when titrated with acid. Phenolphthalein detects the first (CO₂³⁻ → HCO₃⁻), and methyl orange detects the second (HCO₃⁻ → H₂CO₃). By comparing the volumes at each endpoint, the individual concentrations can be calculated.

Peringatan Keselamatan

  • HCl is corrosive
  • Wear safety goggles throughout
  • Handle indicators carefully — they stain

APD yang Diperlukan

goggles lab_coat

Bahan

  • Sodium carbonate/bicarbonate mixture (100 mL)
    Unknown composition
  • Hydrochloric acid (HCl) (100 mL)
    0.1M standardized
  • Phenolphthalein indicator (5 mL)
  • Methyl orange indicator (5 mL)
  • Distilled water (200 mL)

Peralatan

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

Prosedur

1

Pipette 25.0 mL of the carbonate/bicarbonate mixture into the flask.

2 menit
2

Add 2-3 drops of phenolphthalein. The solution should turn pink.

1 menit
3

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

3 menit
4

Titrate until the pink color disappears (first endpoint). Record volume V₁.

10 menit
5

Without refilling the burette, add 2-3 drops of methyl orange to the same flask.

1 menit
6

Continue titrating until the color changes from yellow to orange/salmon (second endpoint). Record total volume V₂.

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7

Repeat the entire process for concordant results.

18 menit
8

Calculate: V(phenolphthalein) = V₁, V(methyl orange only) = V₂ - V₁. Use these to find the individual concentrations of Na₂CO₃ and NaHCO₃.

7 menit

Hasil yang Diharapkan

V₁ corresponds to the carbonate content, and (V₂ - V₁) includes both the remaining carbonate reaction and the original bicarbonate. For pure carbonate, V₂ - V₁ = V₁. Any excess indicates bicarbonate present.

Pembersihan

Neutralize waste solutions before disposal. Rinse all glassware thoroughly.

Detail

Kategori
Titrations
Tingkat Kesulitan
Advanced (University)
Durasi
55 menit
Perkiraan Biaya
$14,00
Langkah
8
Bahan
5

Eksperimen Lainnya

Kurva Titrasi pH 50 min Titrasi Asam-Basa dengan Fenolftalein 45 min Titrasi Asam-Basa dengan Metil Oranye 40 min Titrasi Balik Tablet Antasida 60 min Titrasi Iodometrik Pemutih 50 min Titrasi Kompleksometrik EDTA untuk Kesadahan Air 45 min Titrasi Konduktometrik 50 min Titrasi Pengendapan (Metode Mohr) 45 min Titrasi Redoks dengan Kalium Permanganat 50 min Titrasi Vitamin C dengan Iodin 40 min

Frequently Asked Questions

What is the objective of Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat?
Analisis campuran natrium karbonat dan natrium bikarbonat dengan menitrasinya dengan HCl menggunakan dua indikator secara berurutan: fenolftalein dan metil oranye.
How difficult is Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat?
This experiment is rated as Advanced (University). It takes approximately 55 minutes to complete.
What safety precautions are needed for Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat?
Key safety precautions include: HCl is corrosive; Wear safety goggles throughout; Handle indicators carefully — they stain.
What materials are needed for Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat?
The main materials required are: Sodium carbonate/bicarbonate mixture, Hydrochloric acid (HCl), Phenolphthalein indicator, Methyl orange indicator, Distilled water.
What results should I expect from Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat?
V₁ corresponds to the carbonate content, and (V₂ - V₁) includes both the remaining carbonate reaction and the original bicarbonate. For pure carbonate, V₂ - V₁ = V₁. Any excess indicates bicarbonate present.