Emily attempts to separate a mixture of iodine crystals, table sugar, and iron powder. First, she weighs out an empty beaker, weighs it empty, transfers her mixture to the beaker, and then reweighs it. She then gently heats the mixture under a vacuum to sublime all of the iodine. After the sample has cooled, she reweighs the dry sample containing only iron and sugar. She then takes the remaining sample and adds some distilled water to dissolve the sugar but not the iron. She places a strong rare earth magnet beneath the flask to attract all of the iron particles and pours out (decants) the sugar solution into a new beaker (beaker #2). She also rinses the iron particles once or twice more to make sure all of the sugar is dissolved and decants the rinse water into the beaker with the sugar solution. She then gently warms the iron powder to dry it and reweighs it in the original beaker. Finally, she takes the sugar solution and heats it to evaporate off all the water to obtain dry sugar crystals. She then reweighs beaker #2 containing the dry sugar. Complete Emily’s data table below and calculate the mass percents of iodine, iron, and sugar in her mixture. Mass of empty beaker 132.36 g Mass of beaker + original mixture 177.73 g Mass of mixture Mass of beaker + remaining iron & sugar 170.78 g Mass of beaker + dry iron 145.98 g Mass of empty beaker #2 121.65 g Mass of empty beaker #2 + dry sugar 146.45 g Mass of iodine (I2) in mixture Mass of iron in mixture Mass of sugar in mixture % by mass of iodine (I2) in mixture % % by mass of iron in mixture % % by mass of sugar in mixture % Say that Emily’s experiment goes well until the last step and that her sugar is not completely dry because she was running out of time in lab. How will this affect her percentages—discuss which of her reported percentages of iodine, iron, and sugar will be high, low, or unchanged and why.
Emily attempts to separate a mixture of iodine crystals, table sugar, and iron powder. First, she weighs out an empty beaker, weighs it empty, transfers her mixture to the beaker, and then reweighs it. She then gently heats the mixture under a vacuum to sublime all of the iodine. After the sample has cooled, she reweighs the dry sample containing only iron and sugar. She then takes the remaining sample and adds some distilled water to dissolve the sugar but not the iron. She places a strong rare earth magnet beneath the flask to attract all of the iron particles and pours out (decants) the sugar solution into a new beaker (beaker #2). She also rinses the iron particles once or twice more to make sure all of the sugar is dissolved and decants the rinse water into the beaker with the sugar solution. She then gently warms the iron powder to dry it and reweighs it in the original beaker. Finally, she takes the sugar solution and heats it to evaporate off all the water to obtain dry sugar crystals. She then reweighs beaker #2 containing the dry sugar.
Complete Emily’s data table below and calculate the mass percents of iodine, iron, and sugar in her mixture.
|
Mass of empty beaker |
132.36 g |
|
Mass of beaker + original mixture |
177.73 g |
|
Mass of mixture |
|
|
Mass of beaker + remaining iron & sugar |
170.78 g |
|
Mass of beaker + dry iron |
145.98 g |
|
Mass of empty beaker #2 |
121.65 g |
|
Mass of empty beaker #2 + dry sugar |
146.45 g |
|
Mass of iodine (I2) in mixture |
|
|
Mass of iron in mixture |
|
|
Mass of sugar in mixture |
|
|
% by mass of iodine (I2) in mixture |
% |
|
% by mass of iron in mixture |
% |
|
% by mass of sugar in mixture |
% |
Say that Emily’s experiment goes well until the last step and that her sugar is not completely dry because she was running out of time in lab. How will this affect her percentages—discuss which of her reported percentages of iodine, iron, and sugar will be high, low, or unchanged and why.
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