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/sci/ - Science & Math

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1876437 No.1876437 [Reply] [Original]

Relatively basic question for any chemfags.
When would I use back titration instead of regular titration? eg. we used back titration to find the amount of carbonate in a tablet by adding excess HCl.
Cool wallpaper in return.

>> No.1876439

bump come on /sci/

>> No.1876462

back titration--> you see what amount of known NaOH was used

first you need titration to see what amount of NaOH you have.

>> No.1876463
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1876463

>> No.1876466

>>1876462
*what amount of NaOH was used up by an unknown amount of probe solution

>> No.1876467

Maybe because you can't use a reliable indicator to follow the carbonate/HCl reaction while the HCl/NaOH reaction is easy to follow using a pH-meter.