Titrasi Konduktometrik

Memantau titrasi menggunakan konduktivitas listrik

Titrations Advanced (University) 50 menit ~$20,00

Tujuan

Lakukan titrasi asam-basa menggunakan pengukuran konduktivitas sebagai pengganti indikator, dan tentukan titik akhir dari grafik konduktivitas-volume.

Latar Belakang

In a conductometric titration, electrical conductivity of the solution is measured as the titrant is added. Since different ions have different molar conductivities (H+ and OH- are exceptionally mobile), the conductivity changes non-linearly during titration. The endpoint is found where two straight-line segments of the conductivity curve intersect.

Peringatan Keselamatan

  • HCl and NaOH are corrosive
  • Wear safety goggles and gloves
  • Keep the conductivity probe away from the magnetic stirrer bar

APD yang Diperlukan

goggles gloves lab_coat

Bahan

  • Hydrochloric acid (HCl) (100 mL)
    0.1M
  • Sodium hydroxide (NaOH) (100 mL)
    0.1M
  • Distilled water (200 mL)

Peralatan

50 mL burette Burette stand and clamp 250 mL beaker Conductivity meter with probe Magnetic stirrer 25 mL pipette Graph paper

Prosedur

1

Pipette 25.0 mL of 0.1M HCl into the beaker. Add 50 mL of distilled water to increase volume for the probe.

3 menit Handle HCl carefully
2

Place the beaker on the magnetic stirrer. Insert the conductivity probe and the stir bar.

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3

Record the initial conductivity reading. Fill the burette with 0.1M NaOH.

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4

Add 1.0 mL of NaOH from the burette. Stir for 30 seconds, then record the conductivity and cumulative volume.

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5

Repeat step 4, adding 1.0 mL increments, recording conductivity after each addition. Continue until well past the expected endpoint.

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6

Plot conductivity (y-axis) versus volume of NaOH added (x-axis). Identify the two linear regions.

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7

Draw best-fit lines for the two regions and find their intersection. This is the endpoint.

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Hasil yang Diharapkan

Conductivity initially decreases as highly mobile H+ ions are replaced by less mobile Na+ ions. After the endpoint, conductivity increases as excess OH- ions accumulate. The V-shaped graph clearly shows the equivalence point.

Pembersihan

Remove and rinse the conductivity probe carefully. Neutralize waste solutions before disposal. Rinse all glassware.

Detail

Kategori
Titrations
Tingkat Kesulitan
Advanced (University)
Durasi
50 menit
Perkiraan Biaya
$20,00
Langkah
7
Bahan
3

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Frequently Asked Questions

What is the objective of Titrasi Konduktometrik?
Lakukan titrasi asam-basa menggunakan pengukuran konduktivitas sebagai pengganti indikator, dan tentukan titik akhir dari grafik konduktivitas-volume.
How difficult is Titrasi Konduktometrik?
This experiment is rated as Advanced (University). It takes approximately 50 minutes to complete.
What safety precautions are needed for Titrasi Konduktometrik?
Key safety precautions include: HCl and NaOH are corrosive; Wear safety goggles and gloves; Keep the conductivity probe away from the magnetic stirrer bar.
What materials are needed for Titrasi Konduktometrik?
The main materials required are: Hydrochloric acid (HCl), Sodium hydroxide (NaOH), Distilled water.
What results should I expect from Titrasi Konduktometrik?
Conductivity initially decreases as highly mobile H+ ions are replaced by less mobile Na+ ions. After the endpoint, conductivity increases as excess OH- ions accumulate. The V-shaped graph clearly shows the equivalence point.