Question

PROMPT:

Write down as many correct, distinct, and relevant facts you can about:

Copper can be measured in waste water by reaction with 1-(2-pyridylazo)-2-naphthal (PAN), which creates the substance copper(II)bis(PAN). The absorbance of a 25 mL sample was measured at 550 nm in a cell with path length of 1.00 cm. The value was 0.55 absorbance units. The molar absorptivity of the copper(II)bis(PAN) material is 2.05 x 104 M-1 cm-1.

6 statements are required for full credit. You may write more than six if you are concerned about whether each statement is distinct.

Answer 1

50!: 9 1- (2-pyridylazo) -2 - napthal (PAN) structure is shown beloce AHO. 2) PAN is chelating ligand and, con form chelate Complexis with various metal ions including Copper 3) the structure of coppee cau. bis CPANJ is shown below the coppee is tetra co-ordinated in this structure, 4) the coppei (11) bis cpane). absorbs significantly at 550nm suggest that Compoand is coloured Compound (in the visible region), so Colorometric determination is possible

5) the concentration a j itu The concentration of copper in waste water can be desired ' using Beer lambert law., A={* l *c, As absorbance Ez molal afsorptinily er lambele lain Coefficient, la path length, c = Conc. of analyte, Here &= 2,05x10 mt cnt , A=0.55, Lola Soy CD0.551 (1x2.05X104) concentration of cu 2t = 0.268x104 g 6) Beer Lambert Law, is applicable only to dilete Solutions as 'n Concentrated solutions derivations in absorptinty cocbicients takes place due to electrostatic interactions between molecules that are closer to each others : ach other i