martina asked:
250cm^3 samples of a ground water are titrated with .063M HCl and found to require 26.6cm^3 of acid to adjust the pH to 4.5
250cm^3 samples of a ground water are titrated with .063M HCl and found to require 26.6cm^3 of acid to adjust the pH to 4.5
Calculate the apparent no. of moles of carbonate in this sample.
(need to convert answer to mgL^-1, of carbonate)
tankooh 
xx
Alkalinity in natural ground waters is mainly due to dissolved carbonate ions. In soft water, such as that obtained from a lake in the Wicklow mountains, the carbonate level can be extremely low and reduced to a negligible value by acid rain. hard water such as that obtained from the Dublin canals, may contain several hundreds of mg dm-3 of CO3^2- ions
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Um are you sure thats the whole question?
o.0