25) Calculate the molar solubility of thallium chloride in 0.40 M NaCI at 25°C.

Question

25) Calculate the molar solubility of thallium chloride in 0.40 M NaCI at 25°C. Ksp for TICI is 1.7× 10-4, A) 6.8 x 10-5 M B) 4.2 x 10-4 M C) 8.2× 10-3 M D) 1.3 x 10-2 M 26. What is the maximum concentration of iodide ions that will precipitate Agl but not Pblz from a solution that is 3.8 x 10-3 M each in Ag' and Pb?? For Agl, Ksp 1.5 x 10 1o and for Pb12, K, = 1.4 x 10-8 A) 1.9 x 103 M B) 3.9 x 10-14 M C) 3.7 x 10M D) 1.2 x 10- M E) None of these; Pblz will always precipitate before Agl. BONUS (5 POINTS) What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.5000 M HCI? Ka-3.0 × 10-8 for HOCL

Explanation / Answer

Q25

TlCl = Tl+ + Cl-

Ksp = [Tl+][Cl-]

assume, in equilbirium

[Tl+] = S

[Cl-] = 0.4 + S

1.7*10^-4 = (S)(0.4+s)

s^2 + 0.4s - 1.7*10^-4 = 0

s = 4.255*10^-4

choose B

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