3 A solution was made by mixing 500 mL of 0750 M HCN with 250 mL

) What is the concentration of Ba2+ in a saturated solution of BaF2 in pure water? Ksp (BaF2) = 2.45 x 10-5 ? b) What is the concentration of Ba2+ in a saturated solution of BaF2 in a solution already containing 0.361 mol L-1 NaF?

Mn(OH)2 has Ksp = 4.5 x 10-14. What is the molar solubility of Mn(OH)2 in a solution containing 0.100 mol L-1 Mn(NO3)2?

A solution is made by mixing 0.250 L of 0.020 mol L-1 acetic acid and 1.10 g of potassium acetate (M = 98.15 g mol-1 ). The Ka of acetic acid = 1.8 x 10-5 . a) What is the pH of this buffer? b) What is the pH of this buffer after adding 0.100 mL of a 9.00 mol L-1 solution of KOH?

6. For each reaction, indicate whether the sign of ΔS for the system will be positive or negative. a) C6H6 (g, 500°C) → C6H6 (g, 400°C) b) C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l) c) CO2 (s) → CO2 (g) d) 1 mol H2 (g) in a 1 L container → 1 mol H2 (g) in a 2 L container (constant temperature)

. NH3 has a pKb of 4.74. What is the pH of a 3.2 x 10-4 mol L-1 NH3 solution?

1. For aqueous solutions of the following compounds, indicate whether they will be acidic, basic or neutral. If the salt is either acidic or basic, write out the balanced equation which shows how it is acidic or basic. a) NaNO3 b) LiBr c) KOH d) NaNO2 e) KClO f) NH4I