Titulación Ácido-Base con Naranja de Metilo

Titulación de una base débil con un ácido fuerte

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

Objetivo

Determinar la concentración de una solución de carbonato de sodio titulándola con ácido clorhídrico usando naranja de metilo como indicador, adecuado para puntos finales ácidos.

Antecedentes

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.

Advertencias de seguridad

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

EPP requerido

goggles lab_coat

Materiales

  • 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)

Equipamiento

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

Procedimiento

1

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

3 min
2

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

2 min
3

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

1 min
4

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

8 min
5

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

5 min
6

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

15 min
7

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

5 min

Resultados esperados

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.

Limpieza

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

Detalles

Categoría
Titrations
Dificultad
Intermediate (High School)
Duración
40 min
Costo estimado
$12,00
Pasos
7
Materiales
4

Más experimentos

Curva de Titulación de pH 50 min Retrotitulación de Tabletas Antiácidas 60 min Titulación Ácido-Base con Fenolftaleína 45 min Titulación Complejométrica con EDTA para Dureza del Agua 45 min Titulación con Doble Indicador de Mezcla Carbonato-Bicarbonato 55 min Titulación Conductométrica 50 min Titulación de Vitamina C con Yodo 40 min Titulación por Precipitación (Método de Mohr) 45 min Titulación Redox con Permanganato de Potasio 50 min Titulación Yodométrica de Lejía 50 min

Frequently Asked Questions

What is the objective of Titulación Ácido-Base con Naranja de Metilo?
Determinar la concentración de una solución de carbonato de sodio titulándola con ácido clorhídrico usando naranja de metilo como indicador, adecuado para puntos finales ácidos.
How difficult is Titulación Ácido-Base con Naranja de Metilo?
This experiment is rated as Intermediate (High School). It takes approximately 40 minutes to complete.
What safety precautions are needed for Titulación Ácido-Base con Naranja de Metilo?
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 Titulación Ácido-Base con Naranja de Metilo?
The main materials required are: Sodium carbonate (Na₂CO₃), Hydrochloric acid (HCl), Methyl orange indicator, Distilled water.
What results should I expect from Titulación Ácido-Base con Naranja de Metilo?
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.