Question

Calculate the molar solubility of barium fluoride in each of the following. pure water Express your answer using three significant figures. ? 10 AL * O S - 1.07 • 10-21 Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B 0.12 M Ba(NO3)2 Express your answer using two significant figures. Bil Axo ?

Answer 1

a is the solubility, PART-A: Bafia = Ba2+ + 2F- I . 0 0 е +х т? Ex an Kopa [ ?"] [f+)2 = 483 .: 4x3 - 2145 X70 -5 (x=0.0183 ml pure water molar solubility of Ba 2+ and F- is 0.0183 Part B 0.12 im Ba NO3 .. [Ba2+] = (0:12+2) . Ksp = (0:12 +)(2x) 42? (012 +2) = 245 x103 2²= 2145x10-5 4(0.12 +2) Taking a as small, 32 = 7:144 X10-3 x 100 % 7.144*10*' x100% 5954. Not very small , so we follow internative technique, x= 6.94 x10-3 X = 6.94 X10-3 . 5 = 6.94% 1013] > 0.12

PART C 0.15 m NaF :::17-) = 24+0.15 Ksp = [Ba247 [F-723 736) (0.5 +22)? 2 (0-15 +20)2 = 2.45x10-5 Taking & as very small. : : (015)2 - 2145 x 10-5 A & :loog x10-31 x 100%. 2. 1:09810-3 - 0:15 = 0v 72% " x is small" approximation is valid.