a) An aqueous solution of sodium fluoride is slowly added to a water sample that

Question

a) An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (0.0405M) and calcium ion(0.0735M). The Ksp of barium fluoride is 1.0x10^-6. The Ksp of calcium fluoride is 3.9x10^-11. what is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate?

b) Calculate Qsp for calcium fluoride (Ksp=3.9x10^-11) when 195.0 mL of a 0.00780 M solution of Ca(NO3)2 is added to 175.0 mL of a 0.00740 M solution of KF

c)What is the solubility og ZnCO3 at 25 degree celcius in a buffer solution with a pH of 10.04?

Explanation / Answer

Ksp of calcium flouride = 3.9*10^-11 = conc of calcium * conc of flouride^2.......... 3.9*10^-11 = 0.0735*conc of flouride........... conc of flouride^2 = 3.9*10^-11 / 0.0735----------- conc of flouride = 2.3035 * 10^-5 M........... Ksp of barium flouride = 1.0*10^-6 = conc of flouride^2 * conc of barium......... 1*10^-6 = (2.303*10^-5)* conc of barium... conc of barium = 0.04042 M.............. Remaining conc of barium = 8*10^-5.......

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