Zn(s) + CuSO4(aq) --> Cu(s) + ZnSO4(aq)

Using our ending solution from the last reaction, we carefully weighed out about 2 grams of mossy zinc to add! The result of adding the zinc caused fizzing, color change of the zinc (black-red) and resulted in copper formation!

Shown in this video, the stirring of the reaction showed accuracy because the stirring further exposed areas of zinc that needed to react to complete the reaction


Once all the zinc reacted we were left with bits of copper at the bottom of our beaker. We weighed a piece of filter paper, then we filtered our copper to drain all of the water


Single Replacement Reaction! SO4 attaches to Zn instead of Cu! The driving force is transfer of electrons. CuSO4 dissolves the Zn, leaving just Cu!

3H2SO4(aq) + Cu3(PO4)2(s) -> 3CuSO4(aq) + 2H3PO4(aq)

The precipitate left after the filtering last time


Kendal uses a pipette and accurate gradulated cylinder to accurately measure 12 ml of H2SO4


We add H2SO4 to our filtered precipitate to dissolve it back into a liquid

3CuCl2(aq) + 2Na3PO4(aq) -> Cu3(PO4)2(s) + 6NaCl(aq)

We began adding our NaOH till our solution became cloudy and then turning it back to clear using HCl



Yay for yellow! We knew we had been accurate with our amounts of NaOH and HCl because our pH is at 7!



After our mixture was right, we added Na3PO4 and began to heat it up to get ready for filtering!

CuO(s) + HCl(aq) -> CuCl2(aq) + H2O(l)

The ending result of our filtering left us with this precipitate


Adding HCl to our precipitate began dissolving it back into a liquid


Using Distilled water, Kendal and Kathleen clean the sides of the filter paper to be sure that every last drop of our precipitate makes it into our next steps and reactions!


The ending result was also a Double Replacement reaction! The driving force is the formation of water. Water was formed by the oxygen combining with the hydrogen

Cu(OH)2(s) -> CuO(s) + H2O(l)

Kendal continues to show accuracy when filling the newly made mixture with the correct amount of distilled water



Adding heat to this mixture in the end resulted in turning black! Rina is sure to continuously stir the mixture while it is in the hotplate, another example of this groups awesome accuracy :)


Kathleen and Kendal are preparing for filtering, making sure that everything is working properly!

Cu(NO3)2(aq) + 2NaOH(aq) --> Cu(OH)2(s) + 2NaNO3(aq)

Kathleen also measures at eye level to get the most accurate measurement of NaOH to add to our mixture



The blue cupric nitrate solution from our first reactions reacts with NaOH(aq) and produces a blue cupric hydroxide and sodium nitrate. This reaction was also one of our double replacement reactions! The Copper reacted with the Hydroxide and the Sodium reacted with the Nitrate. The driving force for this DR reaction was the formation of the precipitate (solid). This was brought on because of when together Sodium and Nitrate are insoluble.


Yay for blue! Our acidity is right on track!

Cu(s) + 4HNO3(aq) -> Cu(NO3)2(aq) + 2H2O(l) + 2NO2(g)

Before:


After Heat/HNO3 is added:
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The copper placed in our beaker is reacting and becoming blue cupric nitrate(aq) and is releasing a brown gas (NO2)

Kendal and Rina Strive for Accuracy!

Being at eye level helps make sure measuring out the 5 ml of HNO3 that will be added to the mixture will be accurate!