The Ksp for BaF2 is 2.4 x 10-5. When 10 mL of 0.01 M NaF is mixed with 10 mL of 0.01 M BaNO3, will a precipitate form?

A precipitate will not occur.

Explanation:

2NaF + Ba(NO3)2 --> BaF2 + 2NaNO3

NaF --> Na+ + F-

Ba(NO3)2 --> Ba2+ + 2NO3-

Number of moles of F- = 0.010 x 0.01

= 0.00010 mol

Number of moles of Ba2+ = 0.010 L x 0.01 M

= 0.00010 mol

total volume = 0.020 L

[F-] = [Ba2+]

= 0.00010/ 0.020

= 0.0050 M

Qsp = [Ba2+] . [F-]^2

= 0.0050 * (0.0050)^2

= 1.2 x 10^-7 < Ksp

A precipitate will not occur.

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