September 14, 2024, 03:49:35 PM
Forum Rules: Read This Before Posting

### Topic: Lab: Galvanic Cells - How to calculate standard cell potential  (Read 23014 times)

0 Members and 1 Guest are viewing this topic.

#### sallyhansen

• Regular Member
• Posts: 63
• Mole Snacks: +1/-0
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #30 on: May 09, 2013, 04:19:56 PM »
So the above is the theoretical potential and the measured potential would be the voltmeter reading I have from the lab? Which I got 1.05V.

#### Borek

• Mr. pH
• Deity Member
• Posts: 27783
• Mole Snacks: +1805/-411
• Gender:
• I am known to be occasionally wrong.
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #31 on: May 09, 2013, 04:33:45 PM »
So the above is the theoretical potential and the measured potential would be the voltmeter reading I have from the lab? Which I got 1.05V.

Yes. And you are expected to compare 1.05V (experimental) with 1.1V (theoretical).
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

#### sallyhansen

• Regular Member
• Posts: 63
• Mole Snacks: +1/-0
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #32 on: May 09, 2013, 04:54:21 PM »
So the above is the theoretical potential and the measured potential would be the voltmeter reading I have from the lab? Which I got 1.05V.

Yes. And you are expected to compare 1.05V (experimental) with 1.1V (theoretical).
Which I did with this equation, which hopefully is formatted correctly

% diff. = value 1-value 2(*100)
value 1+value 2
= 1.1 – 1.05    (*100)
1.1+1.05
= 0.05
2.15
=2.33%

#### Borek

• Mr. pH
• Deity Member
• Posts: 27783
• Mole Snacks: +1805/-411
• Gender:
• I am known to be occasionally wrong.
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #33 on: May 09, 2013, 05:07:17 PM »
No, that's not what you did. What is 2.15?

$$difference~\% = \frac{theoretical - experimental}{theoretical}\times 100~\%$$
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

#### sallyhansen

• Regular Member
• Posts: 63
• Mole Snacks: +1/-0
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #34 on: May 09, 2013, 05:28:54 PM »
No, that's not what you did. What is 2.15?

$$difference~\% = \frac{theoretical - experimental}{theoretical}\times 100~\%$$

the 2.15 was me adding 1.1 and 1.05, which now I know is incorrect. Thanks for the equation, really

#### sallyhansen

• Regular Member
• Posts: 63
• Mole Snacks: +1/-0
##### Re: Lab: Galvanic Cells - How to calculate standard cell potential
« Reply #35 on: May 09, 2013, 05:34:06 PM »
No, that's not what you did. What is 2.15?

$$difference~\% = \frac{theoretical - experimental}{theoretical}\times 100~\%$$

Also I ended up getting this. So would I subtract 100 by 10 to get 95.24% as the percent difference?

= 1.1 – 1.05/ 1.05 X 100
= 4.76%

• Mr. pH