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建立人际资源圈Pre-laboratory independent thinking exercises
2015-06-12 来源: 51due教员组 类别: Report范文
本文是常规的化学实验报告，报告蒸发水量，生理盐水质量的解决方案等分析。
1)The amount of water evaporation will increase as the weight percent of NaCl increases.
2)No. NaCl cannot be added and dissolved to the water at some point.
3)The weight percent of NaCl is calculated by dividing mass of NaCl by mass of solution. Thus, I measured the mass of NaCl and water separately with digital scale. The water is contained by a cup and measured by digital scale while NaCl is measured on the water by digital scale.
4)The plot of amount of water evaporated (on the y-axis) versus wt % NaCl (on the x-axis) would look like a linear.
5)Variables like room temperature, the room environment, the dryness of saucepan every time, the time of each experiment, the constant temperature of water etc., should be kept constant.
6)I hypothesize that the water is mixed something else that cannot hold the constant temperature.
Post-laboratory analysis
1)Yes. The amount of water evaporation will increase as the weight percent of NaCl increases.
2)The plot is not exactly like a linear, but the points of all experiment data concentrate on one linear, which trends to be like a straight linear.
3-4 See the table and chart below.
Weight Percentage (%) Water evaporation
Tap water 250 0.00 5.87
Sample A 250 2.00 7.12
Sample B 250 4.00 8.64
Sample C 250 6.00 9.31
Sample D 250 8.00 10.22
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