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Beer-Lambert Law Calculator - Absorbance & Concentration

Calculate Absorbance (A), Molar Absorptivity (epsilon), Path Length (b), or Concentration (c) using the Beer-Lambert law equation. Essential for chemistry, biochemistry, and spectrophotometry applications. Works for UV-Vis spectroscopy, colorimetry, and analytical chemistry measurements.

Beer-Lambert Law

A = εbc

Variables:

  • AAbsorbance (unitless)
    Absorbance (unitless)
  • εMolar absorptivity (L/mol·cm)
    Molar absorptivity (L/mol·cm)
  • bCuvette path length (cm)
    Cuvette path length (cm)
  • cConcentration (mol/L)
    Concentration (mol/L)

How to Use

  1. 1

    Select Target

    Select variabel yang ingin dicari (e.g.: Konsentrasi).

  2. 2

    Input Parameter

    Enter nilai absorbansi, epsilon, and tebal kuvet.

  3. 3

    Calculate

    Dapatkan hasil perhitungan.

Examples

Analyze Larutan

Problem:

A = 0.5, ε = 200 L/mol·cm, b = 1 cm. Cari c?

Solution:
  1. 1.c = A / (εb)
  2. 2.c = 0.5 / (200 * 1)
Result:0.0025 mol/L

Konsentrasi larutan is 2.5 mM.

Frequently Asked Questions

Apa hubungan absorbansi and transmitansi?
A = -log(T), di mana T is transmitansi (skala 0-1).
When hukum ini menyimpang?
Pada konsentrasi very tinggi, hamburan cahaya, or reaksi kimia in larutan.

Related Calculators

Calculator Konsentrasi

Molaritas & Normalitas

Calculator Pengenceran

Campuran larutan

References