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11 Dec 2019

Determine the effect the following errors would have on your determination of the percentages of the components in your mixture. In each case and for each component, indicate if the error would result in a determination of the substance that is too high, too low, or unchanged. Explain

1A. Error: The residue from the filtration was not washed

i. Ammonium Chloride

ii. Salt

iii. Sand

1b. Error: The residue was washed with tap water instead of deionized water

i. Ammonium Chloride

ii. Salt

iii. Sand

1c. Error: Some of the mixture splattered out of the dish during the first heating.

i. Ammonium Chloride

ii. Salt

iii. Sand

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Casey DurganLv2

13 Dec 2019

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Tell what effect each of the following errors would have on yourdeterminations of the percentages of the components in yourmixture. In each case for each component, indicate if the errorwould result in a determination of each substance that is too high,too low, or unchanged. EXPLAIN WHY!

a) some of the mixture splattered during the first heating (sublimation)

ammonium chloride:

salt:

sand:

b) The sublimation was stopped before all the ammonium chloridewas removed.

ammonium chloride:

salt:

sand:

c) The residue was washed with tap water instead of deionizedwater.

ammonium chloride:

salt:

sand:

d) A watch glass was not used to cover the evaporating dishduring the evaporation

ammonium chloride

salt

sand

e)The residue from the filtration was not washed.

ammonium chloride

salt

sand

carminesalmon646

you were analyzing a sample of a mixture of salt, sand, and ammonium chloride. However, you made a mistake and did not dry the empty evaporating dish before taking the mass, 86.214g, and then adding your unknown mixture to wet dish, now 88.425g total. This extra moisture was removed when you heated to remove the ammonium chloride. After heating the total mass was 87.867g. How would this error affect the calculated percentage of ammonium chloride as compared to the true value? (too high, too low, or unchanged), and briefly explain

tealeel168

what would happen to your results if not all of the ammonium chloride was sublimed when it was being heated in step 4 of the procedure. how would this affect the calculated percent of each of the 3 components of the mixture? ammonium chloride: explain sand: explain sodium chloride:explain

Separation of a Mixtur 5) Weigh the evaporating dish and its contents on the digital balance and record the weight on your data sheet 6) Weigh the second evaporating dish with the watch glass cover on it and record the weight on your data sheet. You will use this vaporating dish to collect the sodium chloride solution. 25 mL graduated cylinder and measure out 15 mL of Get a the deionized water. Pour this water over the contents in evaporating dis stir with a stirring rod to dissolve the sodium chloride. 8) Gently pour off the liquid into the second evaporating dish making sure that you leave the solid behind. This is called decanting. 9) Wash the solid in the first evaporating dish with 10 and 5 the evaporating ml of water, making sure to dec the liquid carefully into second second dish after each washing. Your first evaporating dish now contains wet sand and your evaporating dish contains water with dissolved sodium chloride 0) set up a ring stand, iron gauze, and Bunsen burner as is shown in the picture below. Notice that the evaporating dish is not as close to the Bunsen burner as in the earlier step. This is so you can heat the mixture gently. If you're working with a partner, use a econd set up so that the first and second evaporating dishes be heated simultaneously 11) Heat the first evaporating dish gently until the sand in it has completely dried. You may wish to cover the evaporating dish with a watch glass to prevent spatter. Allow this dish to cool to room temperature 2) Weigh the first evaporating dish with the sand and record its weight on your data sheet. 13) Heat the second dish covered with the watch glass until all of the water has boiled off. Be careful not to boil the water too quickly, as this will make a mess and cause you to lose some of the sodium chloride. Allow this dish and watch glass to cool to room temperature 4) Weigh the second evaporating dish with the sodium chloride and watch glass and record its weight on your data sheet. 15) Make sure that you show all of your calculations on the back of your data sheet. Disposal: Pour the dried sand into the jar in the fume hood. The sodium chloride can be washed off the evaporating dish and watch glass in the sink

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Determine the effect the following errors would have on your determination of the percentages of the components in your mixture. In each case and for each component, indicate if the error would result in a determination of the substance that is too high, too low, or unchanged. Explain
		1A. Error: The residue from the filtration was not washed
		i. Ammonium Chloride


ii. Salt


		iii. Sand


1b. Error: The residue was washed with tap water instead of deionized water
i. Ammonium Chloride


		ii. Salt




iii. Sand


		1c. Error: Some of the mixture splattered out of the dish during the first heating.
		i. Ammonium Chloride


ii. Salt


		iii. Sand

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