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Posted by on Monday, April 26, 2010 at 10:17pm.

if an aqueous solution of BA(NO3)2 is added to 1.0 L of a solution containing 0.05 mol F- and 0.075 mol SO4 2-, which salt will precipitate first?

  • Chemistry - , Monday, April 26, 2010 at 10:24pm

    Look up Ksp. Calculate (Ba^+2) needed to ppt BaSO4 and BaF2. The one requiring the smallest (Ba^+2) will ppt first.

  • Chemistry - , Monday, April 26, 2010 at 10:27pm

    I have the Ksp.
    BaSO4 is 1.1 x 10^-10 and BaF2 is 1.8 x 10^-7

    but what do you mean calculate (Ba^2+) needed to ppt BaSO4 and BaF2? how do you do that? that's the part i don't understand.

  • Chemistry - , Monday, April 26, 2010 at 10:52pm

    I misspoke. I thought the sulfate and fluoride were given but they are not. So you need to calculate the solubility
    BaSO4 ==> Ba^+2 + SO4^-2

    Ksp = (Ba^+)(SO4^-2) = 1.1 x 10^-10.
    If we let Ba^+2 = S, then SO4^-2 = S and
    S^2 = 1.1 x 10^-10. Solve for S = 1.05 x 10^-5 M which is Ba^+ in a saturated solution of BaSO4.

    Do the same thing for BaF2 and calculate Ba^+2. Compare.

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