Tuesday, February 5, 2013

Percent Copper

Percent bull and Formula Weight of a Copper Compound

Int celestial poleuction:

In many chemistry problems, you are asked to betoken the percent composition of each element in a coalesce. In this experiment a variation of this basic calculation will be employed. The amount of copper in a compound will be sterilised by turn the secret compound in water. The copper ions in termination will be converted to metallic copper by reaction with milligram metal. To ensure that all of the copper is remove from solution, an excess of magnesium will be used. The excess magnesium will be dissolved by the addition of hydrochloric dose. The hydrochloric acid reacts with the magnesium but not the copper. The copper will be filtered, dried, and weighed. As you already know,

% Copper = mass of copper X 100%
mass of sample

This first equation will sanction you to determine the percent copper in your sample. Another appearance of expressing this relationship is:

% Copper = n(63.55) X 100%
f. w.

Where:n = the frame of copper atoms in the compound
55. = the atomic encumbrance of copper
f. w.

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= the formula weightiness of the compound
Since all of the unknown compounds used in this experiment quit only one copper atom, the second equation gives an voiced way of calculating the formula weight of the compound.

Purpose:

The take of this experiment is to determine the percentage of copper and the formula weight of a copper compound.

Equipment/Materials:

sample of unknown copper compounddistilled water
electronic balance250 mL beaker
magnesium metal6 M HCl
filter paperethanol
acetonefunnel
stirring rodwatch glasses

Safety:
Always wear an apron and look in the laboratory.

Procedure:

1. Obtain a vial of an unknown copper compound. Record the number on the vial in your data table. Measure out about one-half of the contents, and determine the...If you want to get a full essay, order it on our website: Orderessay



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