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Determining Purity

Can anyone help me? I'm a little stuck.

Basically I'm reacting an alkaline (KOH) with an acid (HCl) to determine the purity. The HCl's got a concentration of 1.00mol dm^-3, and I'm using 25ml. I've put that it reacts with 22ml of KOH, and that basically the concentration is 0.88mol dm^-3.

Problem is now I can't see where to go from here. I know the amount of moles I've used, but I can't see how to tell how pure it is.

I'm using this as an example of how to figure out the purity, and so I can guess-stimate the amounts, I'm just getting a little confused as to how you calculate the purity from the concentration instead of using the mass (and so mass produced/max. mass possible to produce).

Sorry if I've worded this badly! Any help would be much appreciated.

Thanks guys. :biggrin:

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