Summary
Summary Galvanic and Electrolytic Cells
- Course
- Institution
Covers all that is needed in the Matric chemistry syllabus under the galvanic and electrolytic cells section all definitions taken from the SAGS and includes diagrams
[Show more]
Seller
Follow
Danetucker
Content preview
GALVANIC AND ELECTROLYTIC CELLSGALVANIC CELLS
Convert chemical energy into electrical energy
Self-sustaining electrode reactions
HALF CELLS
A half-cell consists of an electrode and an electrolyte
Electrolyte – a substance that can conduct electricity by forming free ions
when molten or in solution
Anode – the electrode where oxidation takes place
Cathode – the electrode where reduction takes place
Gaseous half-cells:
The hydrogen half cell
H2 gas bubbled over Pt electrode through an electrolyte containing H +
ions
The chlorine half cell
Cl2 gas bubbled over Pt electrode through an electrolyte containing Cl-
ions
Electrons flow from one half cell to the other
When a voltmeter is attached it will measure a potential difference which will
be the emf of the galvanic cell
The position of the substance of the electrodes must be compared using the
redox table
, Whichever substance is higher on the right of the table is a stronger
reducing agent i.e. it will be oxidised
Anode decrease in mass cathode increase in mass
FUNCTIONS OF A SALT BRIDGE
1) Complete the circuit
2) It maintains half-cell neutrality
Half-cell neutrality:
When cations enter or leave solution they create an excess of either +/- charge
which prevents more cations from entering or leaving solution. The salt bridge
provides either cations or anions in order to balance out the excess charges in
the solutions.
STANDARD CONDITIONS FOR A GALVANIC CELL
Concentration of electrolyte = 1 mol.dm-3
Temperature = 25oC
Gas electrode pressure = 1 atm (100 kPa)
In a galvanic cell electrons flow from - +
STANDARD CELL NOTATION
Anode on left
Cathode on right
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Danetucker. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.57. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
66579 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now