Summary
Summary Mark scheme of Acids and Redox Booklet
- Module
- Acids and Redox
- Institution
- OCR
This is the Mark scheme of the Acids and Redox booklet that has been uploaded as well.
[Show more]
Content preview
AS level ChemistryOCR (Chemistry A – H032, H432)
Acids and Redox
Includes:
Acids
Bases
Neutralisations
Titrations
Preparing standards
Acid-base titration method
Redox
, Acids
Definition
Acids: A species that releases H+ ions into aqueous solution.
Strong Acid: An acid that dissociates completely in solution.
Weak Acid: An acid that dissociates partially in solution.
Common acids that you will have come across already through science are:
Hydrochloric Acid HCl
Sulphuric Acid H2SO4
Nitric Acid HNO3
Phosphoric Acid H3PO4
Ethanoic Acid (vinegar) CH3COOH
When an acid dissociates the H+ is left in the solution:
HCl (aq) H+ (aq) + Cl- (aq)
H2SO4 (aq) 2H+ (aq) + SO42- (aq)
Water in the solution is always in excess.
Acids can come with different strengths: strong and weak.
Strong acids, like the 2 examples above, the H+ completely dissociates.
Weak acids, like in the example below, however only partially dissociates in a
solution. This means only a small amount of the H+ ions in the compound are
separated.
CH3COOH (aq) H+ (aq) + CH3COO- (aq)
The equilibrium symbol is used as the reaction is not complete, and there is both a
forward and a backward reaction.
There are 4 possible hydrogen atoms that could dissociate from the ethanoic acid,
however only 1 does, and this also does not happen in all ethanoic acid compounds.
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 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 letre. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52510 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now