{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Lab1 - Reasina Suvaroporn MASC 110L Experiment 1...

This preview shows pages 1–3. Sign up to view the full content.

Reasina Suvaroporn MASC 110L – 1/27/09 Experiment 1: Determination of Avogadro’s Number by Electro-deposition of Copper Metal Objective: To determine and verify Avogadro’s number by experimenting the electrolysis process using two copper electrodes in a sulfate solution Theory: An electric current is passed between two copper electrodes for lengths of time. Knowing the amperage passed, and for how long, and from all these, calculating the number of coulombs, electrons, copper ions, and moles of copper atoms passed, the Avogadro’s number can then be estimated. Cu 2+ + 2e - Cu ~ Cathode Reaction Cu Cu 2+ + 2e - ~ Anode Reaction Result: In class 1. Total Deposit Time (min) 2. Weight of Positive Electrode (g) 3. Weight Change of Positive Electrode (g) 4. Weight of Negative Electrode (g) 5. Weight of Change of Negative Electrode (g) 0 21.23 0 20.19 0 20 20.75 -0.48 20.65 0.46 40 20.32 -0.91 21.08 0.89 60 19.86 -1.37 21.53 1.34 Q8). Cu 2+ + 2e - Cu ~ Cathode Reaction Cu Cu 2+ + 2e - ~ Anode Reaction Q10). Ideally the weight changes of the two electrodes should be the same but due to the experimental errors, they are slightly different. We lose some Cu build up when washing and drying the Cu electrodes.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Q11).
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

Lab1 - Reasina Suvaroporn MASC 110L Experiment 1...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online