Chemical Changes Calculations and Equations Worksheet

Can youhelp me with the calculations and explain how to do them as well as sources of error. Could you also check if the equations are correct

A Series of Chemical Changes
In this lab you will observe and write equations for some different chemical reactions. You will begin with a piece of
According to the Law of Conservation of Mass, you should have the same mass of copper at the end as you started
w offel –
Procedure: (be sure to record all observations during each step)
Part 1: Conversion of Copper to Copper (IT) Nitrate
nitrogen dioxide, and water.
Observe what happens when copper reacts with concentrated nitric acid solution to form copper (II) nitrate.
Observations: Oranc
943 experts NOLA & blue liquid after nooing H10 Copper (TS) nitive
Balanced Equation: Cu + 4 HNO3 CU (NO3) + 2 H2O2 Heo His
Part 2: Conversion of Copper (IT) Nitrate to Copper (IT) Hydroxide
159 KU (NO), Use a graduated cylinder to obtain 50.0 mL of 0.080 M. copper (II
) nitrate solution and bring
it back to your
187.6, Levenogle
lab station. Pour it into a 250 ml beaker and slowly add 8 mL of 3.0 M sodium hydroxide. Stir the solution
with a glass stirring rod and record any changes. Test the solution with red litmus paper to see if it is basic.
53 (To test, use a stirring rod to transfer one drop onto the paper. Red litmus paper turns Blue in Base.) If it is
* not basic, continue to add sodium hydroxide solution (in 1 mL increments) until it is basic. Sodium nitrate is
produced along with copper (II) hydroxide.
Observations: Chare?
a art ble
Balanced Equation: Cu (NO3)2 + 2NaOH – CU COH). + Z NA NO
Part 3: Conversion of Copper (II) Hydroxide to Copper (II) Oxide (water is also produced)
Place the beaker on a hot plate and carefully bring it to a gentle boil. Stir, and continue heating until all of the
precipitate has changed color. Remove from the heat and allow the suspension in the beaker to settle. Filter
the solution through a piece of filter paper into a 250 mL Erlenmeyer flask. To speed up the filtration
process, transfer as much of the liquid as possible before transferring any solid. Wash the solid in the filter
paper with a small amount of water. The filtrate solution should be transferred to a waste container.
is being hented dalk
9 grey
Observations:_flakes Font, 13
042 CuO+
Balanced Equation:
Part 4: Conversion of Copper (II) Oxide to Copper (II) Sulfate (water is also produced)
Dissolve the solid copper (II) oxide by placing the filter paper into a 250 ml beaker and adding 5 mL of 3 M
sulfuric acid. Make sure that all of the copper (II) oxide dissolves. Using a glass stirring rod or plastic forceps
(not metal!), carefully lift the filter paper out of the beaker. Rinse it over the beaker with water until no trace
of copper compound remains. Discard the paper. The copper (II) sulfate solution should be blue.
Observations: Copper d. bulves into light blue
Balanced Equation CuO+ H2SO4 ? Cu Soy + H20

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