Titrasi Asam-Basa dengan Metil Oranye

Menitrasi basa lemah dengan asam kuat

Titrations Intermediate (High School) 40 menit ~$12,00

Tujuan

Tentukan konsentrasi larutan natrium karbonat dengan menitrasinya dengan asam klorida menggunakan indikator metil oranye, cocok untuk titik akhir yang asam.

Latar Belakang

Methyl orange changes color at pH 3.1-4.4 (red to yellow), making it suitable for titrations where the equivalence point is in the acidic range. Sodium carbonate reacts with HCl in a two-step process: first forming NaHCO₃, then NaCl + H₂O + CO₂. Methyl orange detects the second equivalence point.

Peringatan Keselamatan

  • HCl is corrosive — avoid skin contact
  • Wear safety goggles throughout
  • Methyl orange is an azo dye — avoid contact with skin

APD yang Diperlukan

goggles lab_coat

Bahan

  • Sodium carbonate (Na₂CO₃) (100 mL)
    Unknown concentration
  • Hydrochloric acid (HCl) (100 mL)
    0.1M standardized
  • Methyl orange indicator (5 mL)
    0.1% solution
  • Distilled water (200 mL)

Peralatan

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

Prosedur

1

Rinse the burette with HCl solution, then fill it to the 0 mL mark.

3 menit
2

Pipette 25.0 mL of sodium carbonate solution into the Erlenmeyer flask.

2 menit
3

Add 2-3 drops of methyl orange indicator. The solution should appear yellow (alkaline).

1 menit
4

Add HCl slowly while swirling. Watch for the color change from yellow through orange.

8 menit
5

Near the endpoint, add drop by drop until the solution changes from yellow to a persistent orange/salmon color.

5 menit
6

Record the volume of HCl used. Repeat for concordant results.

15 menit
7

Calculate the concentration of Na₂CO₃ considering the 1:2 stoichiometry (Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂).

5 menit

Hasil yang Diharapkan

The endpoint shows a clear transition from yellow to a persistent orange/salmon color. The volume ratio should confirm the 1:2 molar ratio of carbonate to acid.

Pembersihan

Neutralize waste solutions. Rinse all glassware with distilled water. Drain and rinse the burette.

Detail

Kategori
Titrations
Tingkat Kesulitan
Intermediate (High School)
Durasi
40 menit
Perkiraan Biaya
$12,00
Langkah
7
Bahan
4

Eksperimen Lainnya

Kurva Titrasi pH 50 min Titrasi Asam-Basa dengan Fenolftalein 45 min Titrasi Balik Tablet Antasida 60 min Titrasi Indikator Ganda Campuran Karbonat-Bikarbonat 55 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 Asam-Basa dengan Metil Oranye?
Tentukan konsentrasi larutan natrium karbonat dengan menitrasinya dengan asam klorida menggunakan indikator metil oranye, cocok untuk titik akhir yang asam.
How difficult is Titrasi Asam-Basa dengan Metil Oranye?
This experiment is rated as Intermediate (High School). It takes approximately 40 minutes to complete.
What safety precautions are needed for Titrasi Asam-Basa dengan Metil Oranye?
Key safety precautions include: HCl is corrosive — avoid skin contact; Wear safety goggles throughout; Methyl orange is an azo dye — avoid contact with skin.
What materials are needed for Titrasi Asam-Basa dengan Metil Oranye?
The main materials required are: Sodium carbonate (Na₂CO₃), Hydrochloric acid (HCl), Methyl orange indicator, Distilled water.
What results should I expect from Titrasi Asam-Basa dengan Metil Oranye?
The endpoint shows a clear transition from yellow to a persistent orange/salmon color. The volume ratio should confirm the 1:2 molar ratio of carbonate to acid.