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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: ggxoxo on February 15, 2012, 06:24:36 pm

Title: Back Titration
Post by: ggxoxo on February 15, 2012, 06:24:36 pm

When do you use back titration? One book said: 'When the substance being analysed is insoluble'; what does this mean? Can't you also use direct titraton when he substance in question is insoluble?

Thanks guys!

Title: Re: Back Titration
Post by: vea on February 15, 2012, 06:36:16 pm

You use back titration when you are titrating a weak acid and a weak base. This is because the weak acid and weak base will not be able to provide a clear end point with any indicators.

Someone please confirm this, bit rusty on everything VCE atm.

Title: Re: Back Titration
Post by: mihir94 on February 15, 2012, 08:49:47 pm

You use back titration when the substance you need to analyse is a weak acid or weak base, volatile or insoluble. Not sure that you can't use direct titration if the substance is insoluble, but back titration is definetly the preferred method. Yeah vea you are right.