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What's the Concentration of SO4^-2?
Hello,
I'm having a bit of trouble with a question involving Ksp
I got that the concentration of SO4^-2 is 9.37(mM) (but that's wrong)
The question goes as such...
A 275(mL) sample contains 0.0019(M) Chloride initially.
To determine Sulphate in this sample you titrate with 0.1(M) BaCl2.
The Ksp for BaSO4 is 1.1*10^-10.
If the endpoint is observed at 33(mL), what is the concentration of SO4^-2 in the original sample?
Any help is greatly appreciated!
Thank you in advance!
1 Answer
- Roger the MoleLv 72 years agoFavorite Answer
"Ksp for BaSO4 is 1.1*10^-10" means that BaSO4 is insoluble.
The initial concentration of Cl{-} means nothing (unless there's a following question about the concentration of Cl{-} after the titration).
BaCl2 + SO4{2-} → BaSO4(s) + 2 Cl{-}
(0.1 mol/L BaCl2) x (0.033 L BaCl2) x (1 mol SO4{2-} / 1 mol BaCl2) / (0.275 L) = 0.012 mol/L SO4{2-}
