Slide 1: Silver Crystals Luke Chen, Grace Oh Cici Yang, Alison Yeh
Slide 2: Materials • Copper wire (Cu) 13 cm, 25 cm • Silver nitrate (AgNO3 ) 1.5 g • Beakers 50 ml, 150 ml • Splash proof goggles • Weighing dish • Erlenmeyer flask • Distilled or tap water • Apron • Spatula • Paper towel • Stirring rod • Balance
Slide 3: To make one gram of silver crystals… 1) Create a silver nitrate solution with 1.5 g of silver nitrate and 30 mL of water. Stir to dissolve. 2) Submerge a coiled up 13 cm of copper metal into the solution.
Slide 4: Continued… 3) Remove the copper wire from the solution and rinse off silver crystals into 150 mL beaker. 4) Decant liquid into Erlenmeyer flask. Repeat.
Slide 5: Finally… 5) Leave the beaker undisturbed for one day to completely dry.
Slide 6: Result… 6) Silver!
Slide 7: Observations • Silver nitrate solution became blue. • Crystals formed around the copper wire. • Resulting copper wire became unpolished and had a lighter color. • Mass of resulting copper wire was less than mass of initial copper wire. • Tap water also allowed the formation of silver crystals.
Slide 8: Data Table Mass of silver nitrate Mass of copper wire (initial) Mass of weighting dish Mass of effected copper wire Mass of weighting dish & silver crystals 1.50 g 0.95 cm 2.10 g 1.52 g 2.93g
Slide 9: Calculations Cu(s) +2 Ag(NO3)(s) → Cu(NO3)2(aq) + 2 Ag(s) •Percentage Yield 2.93gweighing dish +product – 2.10gweighing dish=0.83g(Ag) Actual yield: 0.83g(Ag) 1.6g(AgNO3)* 1mol(AgNO3)/ 169.88g(AgNO3)* 2mol(Ag) / 2mol(AgNO3)* 107.87g(Ag)/ 1mol(Ag)= 1g(Ag) Theoretical yield: 1g(Ag) 0.83g(Ag)/ 1g(Ag)* 100= 83% Percentage yield: 83%
Slide 10: • Modified silver crystals can be used in dentistry, photography electronics, mirrors, nuclear reactors, medicine, or money.
Slide 11: Conclusion • Due to a double displacement reaction, the copper wire had roughly .8-.9 grams of silver on it, and the solution turned into a blue-ish cyan color. A silver crystalline was formed. • Possible errors include subsituting distilled water for tap water. Minerals within the water may have altered the result. Inaccurate grams of substances may have also been obtained due to human errors or mechanical errors.