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5. Calculate the percentage of water needed for saturation <br />by following expression: • <br />% Wt. Water Added + Wt. ldater in Air-Dry Samnl.e <br />Satt~ras:ion = Wt. Oven-llry Soi < 100 <br />Water <br />6. Allow saturated paste to stand 4 hours, or longer. <br />7. Transfer paste contents to a Euchner funnel fitted <br />with a low-ash, high-retention filter paper and separate <br />the filtrate by applying a vacuum pressure. <br />S. Collect the filtrate in test tube or bottl•~. If the <br />filtrate is turbid, refilter the solution on a clean <br />filter paper. Record the volume of filterjfecovered. <br />Add 0.5 m1. of 0. 1% sodium hexametaphosphate solution <br />to the filtrate to prevent the precipitation of CaC03 <br />from the extract upon standing. <br />9. Transfer filtrate to 250-m1. volumetric flask and dilute • <br />to volume with boiled, deionized water. <br />10. Measure the pH, conductivity and temperature of the <br />filtrate solution. <br />11. Transfer 100 m1. of the prepared extract into a 100-m1. <br />plastic polyethylene bottle, seal and label as Solution IV. <br />12. Transfer remaining 150 ml. of prepared extract into <br />150-m1, plastic polyeth}~lene bottle, seal and label <br />as Solution V. <br />13. Prepare a blank using water from the same batch of water <br />used to prepare extract samples. Add five drops (0.5 ml.) <br />of 0.1% sodium hexametaphosphate solution to blank. <br />Store blank in polyethylene bottle, seal and label as <br />blank. ' <br /> <br />