Essment #1 Units 1-3 CALCULATOR
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1. Which of the following is the BEST evidence that rusting is a chemical property rather than a
physical property of iron?
Rust can form on
nanyire
iron.
Rust forms slowly.
o
Rust cannot turn back into iron.
o
Rust does not look the same as iron.
CLEAR ALL

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.