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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: shadezofemerald on September 04, 2008, 05:27:48 pm

Title: plz help! Chem problem
Post by: shadezofemerald on September 04, 2008, 05:27:48 pm

i have to account/explain the following situation? :idiot2:

a) Tin metal is added to solutions of tin (II) chloride to prevent oxidation of tin (II) ions by oxygen in air.

b) Blocks of zinc are attached to iron hulls of ships to reduce corrosion.

Can someone plz help me explain these situations using something relating to the electrochemical series?

thanks :laugh:

Title: Re: plz help! Chem problem
Post by: Collin Li on September 04, 2008, 05:49:40 pm

Stronger reductants are closer to the bottom on the right-hand side of the electrochemical series.

Tin metal is a stronger reductant than tin (II) ions, so tin metal can act as a sacrificial anode by oxidising with air, instead of tin (II) ions.

Same reason as above. Zinc metal is a stronger reductant than iron (hence it more readily wants to oxidise).

Title: Re: plz help! Chem problem
Post by: shadezofemerald on September 04, 2008, 10:28:02 pm

kk thanks for your help coblin! ^__^