Activity 3 Directions: Arrange the procedure on how to weigh out a sample of a solid for use in quantitative analysis by placing the number 1-10before the number item. _______Subtract the weight of the 'empty' weighing containers from that of the weighing container plus sample and you now know the mass of chemical, to an accuracy of four decimal places, which has been transferred into your volumetric flask, beaker or conical flask. _______Weigh out the calculated amount of chemical within the accuracy of the balance. _______Check the zero reading on the analytical balance by pressing the bar/button with the balance doors closed. ________Relock the balance pan by pressing the bar/button. ________Carefully transfer the weighing boat or sample tube to the balance pan of the analytical balance (for very accurate work use tweezers or the tongs since the sweat from your fingers will contribute to the weight recorded) and close the balance door. ________Release the balance pan by pressing the bar/button, allow the balance to stabilize and record the weight of the chemical and container. If the last decimal place 'cycles' between two or three numbers, determine the mid-point of the 'cycle' and record this value as the weight. ________Lock the balance pan by pressing the bar/button, remove the sample container and transfer the solid to your volumetric flask, beaker or conical flask by pouring, but do not wet the weighing boat or sample tube with solvent. _______Replace the weighing container on the analytical balance pan, close the balance door and weigh if the last decimal place 'cycles' and record this value as the weight of the 'empty' weighing container. _______Lock the balance pan by pressing the bar/button and remove the weighing container from the balance. _______Subtract the weight of the 'empty' weighing containers from that of the weighing container plus sample and you now know the mass of chemical, to an accuracy of four decimal places, which has been transferred into your volumetric flask, beaker or conical flask.



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