K= 1. The groundwater well used for water supply of City of Prairie View, USA contains 5.3 mg/l of aluminum (A1*3). The city wants to lower the aluminum levels to 0.5 mg/1. (1) How much Aluminum will stay in solution if the pH is reduced to 4.5. (i) on the other hand if the city wants to meet the goal of 0.5mg/l for aluminum, what pH is required. The following equation governs precipitation. Al(OH)3 + A1*+ 3 OH, Ks = 10-32.9 > 2. What amount (mg/l) of NaOH will be required to neutralize 7.1 mg/l of H2SO4. Write the chemical reaction and show the calculations. 3. A 6.7% ionized 0.01M solution is prepared from acetic acid (CH3COOH). What is the pH most nearly? (CH3COOH + CH3COO + H+) 4. The equation below is the formulation of the chemical equilibrium constant equation. Write the corresponding chemical reaction [C] [D] [A][B] 5. Stumm and Lee in 1961 proposed the following kinetic expression for the reaction of Dissolved Oxygen and Ferrous Ion d[Fe] = k[Fe][0][OH-] di a) What is the overall order of the reaction? and what is the order of reaction with respect to hydroxyl ion (OH). b) If we maintain the concentration of oxygen and hydroxyl ions constant what will be the order of reaction? c) What is the change in reaction rate, if pH is increased by one unit while keeping all other parameters constant? 6. The ideal gas law is written as PV = nRT or PV = mRT, where R. = universal gas constant (=0.08208 atm-m /Kmol.K and R is the specific gas constant and R=R/MW. P-is pressure, V is volume, n number of moles, mis mass and T is temperature. Estimate the density (p (rho)=m/V) of 125 mg of carbon dioxide (CO2 --AW C-12, 0-16)) present at 2 atm pressure and 20°C.