12. A copper(II) sulfate solution of unknown concentration is placed in a colorimeter and an absorbance reading of 0.46 is recorded. Using the same solution cell, a 0.055M solution of copper(II) sulfate gives an absorbance reading of 0.34 . What is the concentration of the first solution? 2.4103 Extra close brace or missing open brace 0.35 Extra close brace or missing open brace 0.074 Extra close brace or missing open brace 0.041 Extra close brace or missing open brace