A standard curve for blue food dye gives absorbance vs concentration.
A sample with absorbance 0.40 corresponds to what concentration (path length 1 cm)?
- A
8.0×10⁻⁶ M
- B
0.40 M
- Ccheck_circle
5.0×10⁻⁶ M
- D
5.0×10⁻⁵ M
Explanation
A = εbc; ε = 8.0×10⁴ M⁻¹cm⁻¹. c = A/(εb) = 0.40/(8.0×10⁴ · 1) = 5.0×10⁻⁶ M.