21. Solution to Chemistry Problem

2. For the drug "Furacilin" (FS 42-2522-88), plot a graph of the dependence of optical density on concentration at a wavelength of 375 nm and calculate E1% 1 cm using the table data.

C * 10 ^ 4 % furacilin | 5 | 6 | 7 | 8 | 9 | 10 |
Optical density | 0.326 | 0.392 | 0.458 | 0.522 | 0.589 | 0.655 |

Calculate the concentration of furacilin using the calibration graph and the found value of E1% 1 cm.
Determination method. About 0.02 g (exact mass) of furacilin is dissolved in water in a 100 ml measuring flask and brought to the mark with water. Add 9.5 ml of water to 0.5 ml of the resulting solution, mix and measure the optical density on a spectrophotometer in a cuvette with an absorbing layer thickness of 10 mm relative to water. The optical density of the resulting solution is 0.650. The exact mass of the preparation is 0.0200 g.