Balancing Redox Reactions & 3rd Time's The Charm

Follow the rules!
Follow the rules!
Follow the rules!

Rules to Balancing Equations Using Oxidation Numbers:
(1) Assign oxidation numbers to all species
(2) Identify those two reactant species that change
(3) Temporarily balance the species that change [Miss this step and the balancing could be off!]
(4) Determine electron movement. (Oxdn numbers up - lost electrons; oxdn numbers down, gained electrons)
(4) Balance electrons. [make total gained = total lost]
(5) Balance the remainder.

Example in the text - page 664-665

Followup from this lesson:
handout: Balancing Equations Using Oxidation Numbers

Next lesson: Balancing Redox Reactions in Acidic and/or Basic Conditions Using Oxidation Numbers

If you were determining the molar mass of a solid acid.   Basic Instructions have been moodlized.
What concentration of NaOH might you use? ~01.M-0.2M Solid acids can have larger molar masses. 50g/mol to 250g/mol
What volume of that 0.1~0.2M NaOH solution would you prepare....maybe 500mL (or more....)

If you opt to carry out the 3rd Time's The Charm Titration - have all of the calculations completely mapped out. In the lab the only thing that you would then need to do is (1) the titration and (2) finishing the calculations usign the titration values.
Wed Dec 16th = make and standardize base (~30 minutes)
Thurs Dec 17th= determine molar mass of acid day (~30 minutes)

This is not a 'big to do'. There are lots of procedures out there on the www that give instructions for determining the molar mass of a solid acid sample.

A few other tidbits.
(1) You may make and standardize the base with a partner BUT you will each be given your own separate acid for molar mass determination. Partners require more base than individuals.
(2) The complete calculation is submitted before leaving on Thursday. See moodle for expectations of submission.
(3) Not everyone is carrying out this lab, it is not necessary to use your lab book for this 'extra'. You can if you want to, but it is optional. [Adherence to safety rules is not optional :<]