answer question number 3 CEE 4990 CHE 4973/6810 Brewing Engineering Summer, 2018
ID: 706409 • Letter: A
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answer question number 3
CEE 4990 CHE 4973/6810 Brewing Engineering Summer, 2018 (Due July 11, 2018) The water profile for Yourtown is below. All concentrations are in ppm as the ion City Ca". Mg". HCOS Na?CISO,' RA Yourtown 40 8100 15 35 32 50 1. Use the Palmer nomograph to confirm the residual alkalinity. 2. Pale ale questions. a. The recommended range of calcium for a pale ale is 50-150 ppm. If you usea gypsum (CaSO4) to increase the calcium ion concentration to 100 ppm, and you had O gallons (37.8 L), how much gypsum would you add? What would the new sulfate concentration be? What is the new RA? Would this be okay for a pale ale? b. Assuming that the RA is not yet appropriate for a very pale ale, we will reduce the total alkalinity to zero with the addition of an acid solution. What is the bicarbonate (HCO3) ion concentration in terms of meq/L? The equivalent weight of bicarbonate is 61 mg/mEq, If a 1 N solution of lactic acid is to be used, what volume of the solution is required to treat 10 gal (37.8 L) to give a total alkalinity of zerof? c. 3. Pilsener questions. a. If you wanted to decrease the bicarbonate to 50 m/L by diluting your water with distilled water, how would you do this? What is the new calcium ion concentration? What are the concentrations of the other ions? How much calcium chloride (CaCI2) salt must be added to 10 gal to raise the calcium ion concentration to 50 ppm? What is the new chloride ion concentration? b. c. d. If a 1 N solution of lactic acid is to be used, what volume of the solution is required to treat 10 gal (37.8 L) to give a total alkalinity of zero?Explanation / Answer
3.)
a)As the initial concentration of HCO3- is 100 mg/L so to decrease the concentration of the HCO3- to 50 mg/L Hence we need to add distill water to the water of my town in a ratio of 1:1 to get the required dilution of the water for our purpose.Hence for 10 Gallons of water we need 5 gallons of distilled water and 5 gallons of water.
b) Ca2+ ion concentration is 20 mg/L Mg2+ ion concentration is 4 mg/L Na+ ion concentration is 7.5 mg/L Cl- ion concentration is 17.5 mg/L SO42- ion concentration is 16 mg/L and RA is 25 mg/L ..
c)The amount of Ca2+ needed is 50 mg/L and the initial concentration is 20 mg/L ,Hence the required amount of Total Ca2+ concentration needed is 30 mg/L.Hence total Ca2+ to be added is 30*37.8=1134 mg of Ca2+ is needed.Therefore the necessary CaCl2 (Molar mass= 111 units )to be added is (111*1134/40) mg = 3146.85 mg of CaCl2 is need to be added.
The new Chloride amount after the CaCl2 is added (111*3146.85/71) mg = 4919.72 mg
Chloride concentration per litre after addition of CaCl2 is (4919.72/37.8) mg/L = 130.151 mg/L
Total Chloride concentration is 130.151 + 17.5 = 147.651 mg/L
d) 1 Normal of Acetic acid means it contains 1000 ppm of H= ion Hence for neutralising the total amount of basicity is (50*37.8/1000)L = 1.89 L of 1 N Acetic acid is to be added to the solution to make it neutral.
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