Question

25.0 ml C solution is diluted to 50.0 ml and the absorbance is 0.416 in 348 nm in a 1.00-cm cuvette. 25.0 ml second solution is added 10.0 ml solution that contains 23.4 ppm of C. After diluted to 50.0 ml this solution has absorbance 0.610 in the same cuvette and wavelength. Calculate concentration (ppm) C in sample.