to Determine the Concentration 1 Density is defined as the mass per unit volume d mv Relation between the density of liquid compound and its concentration like ID: 1026127
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1. Measuring the Density to Determine the Concentration 1
2. 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
3. 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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6. 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
7. 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 as follows: 7Density (gm/ml)Concentration % (w/v)2468101214
8. Plot a curve (Calibration Curve) between the density on y-axis and concentrations % (w/v) on the x-axis as follows: 8
9. Calibration Curve9
10. Measure the density of unknown solution. Find the concentration of the unknown solution from its density by plotting on the calibration curve.10
11. 11densityConc. Of Unknown
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