All Questions
Tagged with experimental-chemistry electrochemistry
80
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Surface treatment and current density: electrodeposition of Cd and Ag
I'm currently working on a cadmium and silver electrodeposition project.
Let me explain:
I'm doing electrolytic surface treatment on low-alloy steels as well as stainless steels. At present, we have ...
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Addition of NaCl to the Anode Side of a Zinc-Copper Votaic Cell
I used a NaCl solution with a Zinc electrode in an otherwise standard voltaic cell with a Potassium Nitrate Salt Bridge and Copper Sulfate solution in the Cathode side. All the solutions were 1M.
I ...
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Voltammogram during calibration is not smooth
During calibration for differential pulse voltammetry, the voltammogram obtained has two distinct peaks. I am not sure why I am getting two peaks in the range from $\pu{-0.6 V}$ to $\pu{-0.9 V}.$ I ...
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How to determine uncompensated or solution resistance of a 3 electrode setup for IR correction?
To correct for ohmic losses from the potential drop across the electrolyte due to the distance between the electrodes, electrochemical impedance spectroscopy (EIS) is typically employed to measure ...
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2
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1
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Uncertainty for repeated measurements
I am having some trouble calculating the percent uncertainty of obtained cell potential. My cell potentials were 1.788, 1.787, and 1.792 volts with the uncertainty of voltmeter $\pm$ 0.001 volts. Here ...
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Water Electrolysis Efficiency
During my water electrolysis with NaOH, I measured the voltage and current, and the volume of gases (hydrogen and oxygen) displaced at every 30-second interval. 10g NaOH in 2L water for 8 minutes.
...
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Why the change of the position of the salt bridge or metal piece leads to different voltage value?
I am doing an experiment where I use salt bridge to create galvanic cell. The goal of my experiment is to find if there is some correlation between the amount of solvent being used and the voltage ...
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battery using zinc, copper, and vinegar
I filed one side of a penny to reveal the zinc; then I bent the coin and dropped it into a cup of white vinegar. Shortly afterward, many tiny bubbles were forming on the zinc side. Later on, I noticed ...
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3
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What is mAh/g Specific capacity?
In battery chemistry I've been reading about specific capacities of various electrochemical cells as $\pu{mAh/g}$. For example, in one article it says the specific capacity of the system is $\pu{75 ...
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Are there any chemistry research classification systems?
There are research classification systems for mathematics (MSC) and physics (PACS and subsequently PhySH) which help the researchers to navigate through codes composed by letters/numbers made by ...
3
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Products formed on the reduction of KMnO4 in aqueous solution
The Latimer diagram for $\ce{MnO^-_4}$ is given below:
$$ \ce{MnO^{-}_4 ->[0.56V] MnO^{2-}_4 ->[2.26V] MnO_2 ->[0.95V] Mn^{3+} ->[1.51V] Mn^{2+} ->[-1.18V] Mn}$$
Then I have calculated ...
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Ecell value for non spontaneous reaction
I've done my electroplating experiment but got stuck to calculate my E cell value.
So my equations are like these coz I used copper stripes and copper sulphate solution. Some website says E cell can'...
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1
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272
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What would happen to the cell potential if two half cells of a galvanic cell were at different temperatures?
I'm doing an experiment where I'm investigating the effect of temperature of the galvanic cell on the cell potential. But during the experiment, I noticed that the two half cells were at different ...
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1
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145
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In electrolysis, can conductivity be used to predict current?
Since conductivity is the reciprocal of resistivity, it can be used to calculate resistance in the following equation:
$$R=\frac{\rho l}{A}$$
$$R=\frac{l}{\kappa A}$$
Could this, along with Ohm's Law ...
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How did we find relative atomic masses in 18th century or early 19th century? [duplicate]
The atomic masses of atoms or relative atomic masses were known in the 19th century.
But how did they actually calculate that relative atomic mass?
What I think is that if we have a sample of an ...
