Question

Problem 3. The titration of 1L of surface water (pH 10) to pH 7 requires 10 mL of 0.15M sulfuric acid. 1) What is total alkalinity? (10 pts) 2) Develop the equation for calculating pH when 50 mg/L of alum (Al2(SO4)3·14H2O (MW= 594 g/mol) is added to this surface water (the equation should be composed of one unknown variable(pH) and known values(equilibrium constants). (10 pts) (there is no volume change from the addition of sulfuric acid) <Hint> H2CO3* ? HCO3- + H+ K1 = 10^-6.3 at 25°C HCO3- ? CO3^2- + H+ K2 = 10^-10.3 at 25°C H2O ? H+ + OH- Kw = 10^-14 at 25°C

          Problem 3. The titration of 1L of surface water (pH 10) to pH 7 requires 10 mL of 0.15M sulfuric acid. 1) What is total alkalinity? (10 pts) 2) Develop the equation for calculating pH when 50 mg/L of alum (Al2(SO4)3·14H2O (MW= 594 g/mol) is added to this surface water (the equation should be composed of one unknown variable(pH) and known values(equilibrium constants). (10 pts)
(there is no volume change from the addition of sulfuric acid)

<Hint>
H2CO3* ? HCO3- + H+ K1 = 10^-6.3 at 25°C
HCO3- ? CO3^2- + H+ K2 = 10^-10.3 at 25°C
H2O ? H+ + OH- Kw = 10^-14 at 25°C

Problem 3. The titration of 1L of surface water (pH 10) to pH 7 requires 10 mL of 0.15M sulfuric acid. 1) What is total alkalinity? (10 pts) 2) Develop the equation for calculating pH when 50 mg/L of alum (Al2(SO4)3·14H2O (MW= 594 g/mol) is added to this surface water (the equation should be composed of one unknown variable(pH) and known values(equilibrium constants). (10 pts)
(there is no volume change from the addition of sulfuric acid)

<Hint>
H2CO3* ? HCO3- + H+ K1 = 10^-6.3 at 25°C
HCO3- ? CO3^2- + H+ K2 = 10^-10.3 at 25°C
H2O ? H+ + OH- Kw = 10^-14 at 25°C

Added by Charles R.

Question

Please give Ace some feedback