The weight of an empty container is the TARE WEIGHT. The weight of the container WITH a sample is the GROSS WEIGHT. By subtracting the tare weight from the gross weight, you have the weight of the sample itself. This is the NET WEIGHT. When you begin an experiment, you have a STARTING or INITIAL WEIGHT. At the end of the experiment, you have a FINAL WEIGHT. When you express a fraction gained or lost in terms of the whole sample, you calculate a PERCENTAGE. Please answer the following questions:
"The tare weight of a watch glass is 3.025 grams. The gross weight (wet) of a soil sample is 9.034 grams. After drying the gross weight (dry) is 7.084 grams."
A. What is the weight of the water in the sample?
(All you have to do is subtract the dry gross weight from the wet gross weight. You don't have to account for the weight of the watch glass since it has not changed in weight.)
B. What is the dry weight of the soil in the sample?
(Subtract the tare weight from the dry gross weight.)
C. What is the percentage water in the sample?
(You want to know how much water was in the dry soil, as a percentage. Divide the amount of water by the amount of soil and multiply by 100.)
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