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- What is the value of pk, for the fluoride anion, F at 25°C? Ka(HF) = 7.1 x 10-4? Express your answer in decimal notation rounded to three significant figures.Write the Ksp expression for the sparingly soluble compound lead bromide, PbBr₂. Ksp = A₂ A³ A₂ If either the numerator or denominator is 1, please enter 1Calculate the concentrations of Ca and V2O5 as molar concentrations and p-functions.
- Write the Ksp expression for the sparingly soluble compound barium phosphate, Baz(PO4)2. Ksp = A₂ If either the numerator or denominator is 1, please enter 1Calculate the pH of a 0.05 mol dm-3 CH3COOH solution; the dissociation constant Ka for CH3COOH is 1.72 x 10-5 mol dm^-3 .The ionization constant (Kb) of aniline (C6HSNH2) is 2.35 x 10-5. If 7.285 grams of aniline is dissolved in 100.0 mL of water, what are the equilibrium concentration of all species present?
- pKa values are different in different solvents. For example, the pKa of hydrofluoric acid (HF) in water is 3.45, but the pKa of hydrofluoric acid in DMSO (dimethyl sulfoxide) is 15.0. Choose the best explanation for the differenceCalculate a value for the equilibrium constant for the reaction (6)*O = (6)0 + (6) ²0 given hv NO2 (9) NO(g) + O(g) K = 2.3 x 10-49 O3 (9) + NO(9) = NO,(g) + O2(9) K = 8.4 x 10-34 (Hint: When reactions are added together, the equilibrium expressions are multiplied.) K =Coral structures found in the Great Barrier Reef are composed of calcium carbonate, CaCO3, and are under threat of dissolution due to ocean acidification. Consider the following equilibrium reaction equation. CaCO3(s) + CO2(aq) + H2O(l) ⇌ Ca2+(aq) + 2HCO3–(aq) Write the expression for the equilibrium constant, Kc for this reaction. Predict whether the pH of the ocean will increase or decrease as a result of a decrease in the partial pressure of carbon dioxide in the atmosphere (circle your answer). Calculate the molar solubility (s) of calcium carbonate in water at 25 °C when Ksp = 4.5 ´ 10–9.
- O Ni(H₂O)2+ (aq) + 3SCN- (aq) = Ni(SCN); (aq) + 6H₂0(1) (a) Write the Kc expression for this equilibrium. (b) Would there be a shift to the right or to the left if KSCN solution was added to a solution containing this equilibrium? Explain your answer.Write the Ksp expression for the sparingly soluble compound calcium phosphate, Ca3(PO4)2. Ksp = If either the numerator or denominator is 1, please enter 1.Sulfur dioxide is a common preservative in wine; it prevents oxidation and bacterial growth. When SO2 is added to wine, it reacts with water to form an equilibrium system with the bisulfite ion: SO2(aq) + H2O(l) ↔↔H+(aq) + HSO3-(aq) In this equilibrium system, SO2, is called "molecular SO2"; in its HSO3- form it is called "free SO2". Only molecular SO2 acts like a preservative. The amount of molecular SO2 in the equilibrium system is highly pH dependent. The lower the pH, the more the equilibrium shifts to the left and the greater the amount of free SO2 is present. (it favors the reactants). The recommended amount of free SO2 is 0.8 ppm for white wine and 0.5 ppm for red wine. The table below shows the amount of free SO2 required to obtain the correct amount of molecular SO2 as a function of pH for both red and white wine. For dilute solutions such as these, 1 ppm = 1 mg/L. Using the table values, answer the following questions. Table: Amount of free SO2 required to maintain…