Description


some of the answers for the report sheet are in this description:

Watch the following video to get an idea of what the experiment looks like – although there are some differences in our procedure.

A. Determination of Mass Percent of Ammonium Chloride

Fill in the following on your report sheet:

Mass of evaporating dish and original sample: 54.85 g

Mass of evaporating dish: 52.31 g

Mass of original sample: (determine on your own)

Mass of evaporating dish (and sample) after subliming NH4Cl: 54.73 g

Mass of NH4Cl: (determine on your own)

Percent of NH4Cl: (determine on your own, see the equation in Example 2.1)

B. Determination of Mass Percent of Sodium Chloride

Fill in the following on your report sheet:

Mass of evaporating dish, watch glass, and NaCl: 64.36 g

Mass of evaporating dish and watch glass: 63.83 g

Mass of NaCl: (determine on your own)

Percent of NaCl (show calculations): (determine on your own, see the equation in Example 2.1)

C. Determination of Mass Percent of Silicon Dioxide

Fill in the following on your report sheet:

Mass of evaporating dish and SiO254.26 g

Mass of evaporating dish: 52.31 g

Mass of SiO2(determine on your own)

Percent of SiO2 (show calculations): (determine on your own, see the equation in Example 2.1)

D. Determination of Percent Recovery

All of Part D. on the report sheet: (determine on your own)

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Instructors: Please change the data from class to class

A. Determination of Mass Percent of Ammonium Chloride

Mass of evaporating dish and original sample45.386 g
Mass of evaporating dish42.694 g
Mass of original sample
Mass of evaporating dish after subliming NH4Cl44.992 g
Mass of NH4Cl
Percent of NH4Cl (show calculations)

B. Determination of Mass Percent of Sodium Chloride

Mass of evaporating dish, watch glass, and NaCl98.580 g
Mass of evaporating dish and watch glass97.526 g
Mass of NaCl
Percent of NaCl (show calculations)

C. Determination of Mass Percent of Silicon Dioxide

Mass of evaporating dish and SiO243.902 g
Mass of evaporating dish42.694 g
Mass of SiO2
Percent of SiO(show calculations)

D. Determination of Percent Recovery

Mass of original sample
Mass of determined (NH4Cl + NaCl + SiO2)
Differences in these welghts
Percent recovery of matter = g matter recovered /g original sample x 100% =
Account for your errors

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