MEASURING THE DENSITY TO DETERMINE THE CONCENTRATION 1

MEASURING THE DENSITY TO DETERMINE THE CONCENTRATION 1

DENSITY: IS DEFINED AS THE MASS PER UNIT VOLUME. D = M/V RELATION BETWEEN THE DENSITY OF LIQUID COMPOUND AND ITS CONCENTRATION, LIKE NACL SOLUTION. 2

THERE ARE MANY METHODS TO EXPRESS THE CONCENTRATION OF SOLUTIONS, LIKE: %, PPM, M, N, . . ETC. % = WEIGHT/VOLUME X 100 (SOLID) % = VOLUME/VOLUME X 100 (LIQUID) 3

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PROCEDURE • PREPARE DIFFERENT SOLUTIONS CONTAINING (2, 4, 6, 8, 10, 12, AND 14) % NACL, BY WEIGHING (2, 4, 6, 8, 10, 12, AND 14) G OF NACL AND DISSOLVING IN A BEAKER WITH A SMALL AMOUNT OF D. W. • TRANSFER (QUANTITATIVE TRANSFER) TO A 100 ML VOLUMETRIC FLASK. • COMPLETE TO THE MARK WITH D. W. • STOP THE VOLUMETRIC FLASK WITH STOPPER. • SHAKE IT WELL. 6

• FIND THE DENSITY OF EACH ONE OF THE SOLUTIONS ABOVE ACCORDING TO THE PROCEDURE OF MEASURING THE DENSITY OF LIQUID COMPOUNDS, AND RECORD IN A TABLE Concentration AS FOLLOWS: % (w/v) 2 4 6 8 10 12 14 Density (gm/ml) 7

• PLOT A CURVE (CALIBRATION CURVE) BETWEEN THE DENSITY ON Y-AXIS AND CONCENTRATIONS % (W/V) ON THE X-AXIS AS 8

CALIBRATION CURVE 1, 6 1, 4 Density(g/ml) 1, 2 1 0, 8 0, 6 0, 4 0, 2 2 4 6 8 10 12 14 9 % (w/v)

• MEASURE THE DENSITY OF UNKNOWN SOLUTION. • FIND THE CONCENTRATION OF THE UNKNOWN SOLUTION FROM ITS DENSITY BY PLOTTING ON THE CALIBRATION CURVE. 10

1, 6 1, 4 Density(g/ml) 1, 2 density 1 0, 8 0, 6 0, 4 Conc. Of Unknown 0, 2 2 4 6 8 10 12 14 % (w/v) 11

Thank you for Attention 12