4. Acids and Redox
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What are reduction and oxidation in terms of electrons?
reduction: gain of e- oxidation: loss of e-
What are reduction and oxidation in terms of oxygen?
reduction: removal of oxygen from a compound oxidation: addition of oxygen to a compound
What are reduction and oxidation in terms of oxidation number?
reduction: a decrease in oxidation number (becomes more negative) oxidation : an increase in oxidation number (becomes less negative)
What makes a strong acid strong?
it releases all its H+ ions and completely dissociates in aqueous solution
How do you prepare a standard solution?
weigh out solute in boat to 0.01g and transfer to beaker wash out boat and reweigh : find out difference stir to dissolve solute, rinse beaker into volumetric flask top up to line with distilled water + pipette invert + label
What are the tolerances of 10cm pipette 25cm pipette 50cm burette
+-0.04 +-0.06 +-0.10
Describe how to do a titration
p44
Name 2 acid + metal reactions which redox
zinc + HCl aluminium + H2SO4