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Preparation of the test solution
Filter immediately into a clean, dry flask. Stopper the flask. Carry out the determination immediately after filtering.
Note:If the filtrate gradually becomes cloudy, make another extraction following 7.1 and 7.2 in a flask of volume Ve. Filter into a calibrated flask of volume W which has previously been dried and has received 5.00 ml of dilute hydrochloric acid (4.1). Stop the filtration at the exact moment when the calibration mark is reached. Mix thoroughly.
Under these conditions the value of V in the expression of results is:
No math image to display
The dilutions in the expression of results depend on this value of V.
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