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Exp_5_Atomic_Emission_Spectrophotometry - Exp 05 Sec 51...

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Exp: # 05 Abdullah Barashid Nov 20 th 2006 Sec: # 51 236343 Omar Bugshan 236287 Title: ATOMIC EMISSION SPECTROPHOTOMETRY ( Determination of Sodium in Cement Using Flaming Emission Spectrophotometry ) Objective: "To determine the concentration of sodium in the soluble part of a cement sample." Equipment & Apparatus: Flame Emission Spectrometer Beakers: 150 ml, 250 ml Burette: 10 ml Pipette: 5 ml, 50 ml Volumetric flask: 8 x 100 ml, 250 ml Spatula Glass rod Watch glass Filter paper Reagents & Chemicals: Sodium chloride (solid) m.wt 58.44 Unknown: cement sample ( Unknown # 2 ) Calcium solution Concentrated Hydrochloric Acid Data: Flask 1 (blank) 2 3 4 5 6 (unknown) Absorption (%T) 0.001 0.184 0.449 0.61 0.72 0.875 0.681 ml of Stock Na solution 0 1 3 5 7 10 ---- Concentration (ppm) 0 0.9888 2.9664 4.944 6.9216 9.888 ----
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Calculation & Analysis: Determining conc. of standard Na: 0.025g x (57.44/22.99) = 0.0625 g NaCl used 0.0625 g 100 ppm 0.0618 g X X = 98.88 ppm Sample calculation: C 2 = ( 1 ml/ 100 ml ) x 98.88 ppm = 0.9888 ppm Plotting %T vs. concentration we obtain the following graph: Determination of Sodium y = 0.086x + 0.1045
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