Chapter 4 - Acids and Redox Flashcards
Define a strong acid.
Releases all its hydrogen atoms into solution ans H+ ions and completely dissociates in aqueous solution.
Define a weak acid.
Only releases a small proportion of its available hydrogen atoms into solution as H+ ions and partially dissociates in aqueous solution.
Define an alkali.
A base that dissolves in water releasing hydroxide ions into the solution.
What are the products of a neutralisation reaction of an acid and metal oxide/hydroxide?
A salt and water molecule are formed.
What is the equation of an acid and an alkali?
Acid + Alkali ——-> Salt + Water
What is the equation for the reaction between an acid and a metal carbonate?
Acid + Metal Carbonate ———> Salt + Water + Carbon Dioxide.
Define ‘titration’.
A titration is a technique used to accurately measure the volume of one solution that reacts exactly with another solution.
What can titrations be used for?
- Finding the concentration of a solution
- Identification of unknown chemicals
- Finding the purity of a substance
Define ‘standard solution’.
A standard solution is a solution of known concentration.
What equipment would you use to make up a standard solution?
A volumetric flask
List the apparatus you would use in an acid base titration.
- conical flask
- burette
- indicator
- pipette
- pipette filler
What are ‘concordant titres’?
Titres that are within 0.1cm*3 of each other.
What is the oxidation number for any element?
0
What is the rule for combined atoms in redox reactions?
sum of the oxidation numbers = total charge
Define ‘oxidation’ and ‘reduction’.
Oxidation is the gain of oxygen and reduction is the loss of oxygen AND oxidation is loss of electrons and reduction is gain of electrons.
