Question

Preparing Dilute Solutions C1 V1 C2 V2 C1 is the concentration of the original concentrated solution V1 is the volume of the original concentrated solution C2 is the concentration of the final dilute solution V2 is the volume of the final dilute solution A common solution unit is mol/L which can also be written as M. A solution that is 0.1 M NAOH has 0.1 moles Na OH for every liter of solution. Beer's Law Calibration Curve A colored solution absorbs visible light with wavelengths that vary between approximately 400 nm and 700 nm. A spectrophotometer or colorimeter can create light tuned to a specific wavelength, pass this light through a sample of the colored solution, and determine the amount of light that is absorbed/transmitted. For example, an aqueous solution of the complex ion Cu(NH3)42+ is a deep blue color and exhibits a maximum light absorption around 620 nm. The colorimeter actually measures percent transmittance of light but this can be converted to absorbance. Absorbance plotted as a function of the complex ion concentration is known as a Beer's law plot (absorbance has no units): Absorbance as a Function of Concentration for Cu(NH3)42+ at 620 nm 0.500 0.400 0.300 0.200 0.100 0.000 0.0000 0.0400 0.0200 0.0600 0.0800 0.1000 Concentration of Cu(NH3)42 (M) Absorbance

Answer 1

t. @ We know, av,=C2 V2 Anne Now, Q = 0.1250CM), V; = 15.0mb vz = 20.0mb i C2 = GV = L0-1250x 15.0 * 15:0).(M)=0.09375(M) 20.0 . The concentration of dilute sob is 0.09375(M) 6 Here, G= 0.1250 (M) , V = 10ml V2 = 20 ml 10.1250*10 (M)= 0.0625(M). :: The concentration of dilute sol = 0.0625(M) © Here, q=0.1250 (M), V, = 5 mL , V2 = 20m +62 = GV = 0.125x5.CM] = 0.03125 CM) - The concentration of dilute sol = 0.03125 CM) 20 VS 20