Spec lab

Today in class we conducted the spec 20 lab using a spectrophotometer. To start out the spectrophotometer was zeroed out using a cuvette with just water in it and adjusting the % transmittance. Once it was zeroed out we placed a cuvette with Cr(NO3)3 in the spectrophotometer and recorded the % transmittance and absorbance. Next we placed a cuvette with CoCl2 and recorded its % transmittance and absorbance as well. We repeated this for many different wavelengths for both solutions.