Homework Answers
1. Ct = Dh ÷ t
Where Dh = Disinfection hurdle.
t=time
From the given value of Ct=100 and t=5 we can calculate Dh, which is 500.
As pH remains same
Calculating Ct at 9°C
Ct= Dh÷t
Ct = 500÷7
Ct= 71.4
Calculating Ct at 16° C
Dh= 500
Ct= 500÷16
31.25
3. 3-log inactivation of viruses refers to 99.9%0removal.
1-log =90% removal
2-log=99% removal
3-log=99.9% removal
4-log=99.99% removal
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Problem 5. Ct.99% for protozoan inactivation by hypochlorous acid (HOCI) at pH = 7 and T...
Help please and show all work! 2. The pk, of hypochlorous acid (HOCI) is 7.53. (a) Calculate the k. of HOCI. Given t...
Help please and show all work!
2. The pk, of hypochlorous acid (HOCI) is 7.53. (a) Calculate the k. of HOCI. Given that the pk, of hypobromous acid (HOBr) is 8.63, which acid is stronger, and how do you know? (b) Write the reaction (with physical states) that corresponds to the K, of HOCI. Identify the weak acid among the reactants (label it WA) and its conjugate base among the products (label it CB). (c) Calculate [H30*] (or "[H]") and...
Problem Set 15 CHEM 1252 November 10, 2019 Textbook Reading Assignment: 15.5-8 [and see App. 5...
Problem Set 15 CHEM 1252 November 10, 2019 Textbook Reading Assignment: 15.5-8 [and see App. 5 for Kor k, values] Additional Practice Problems: 15.51,57,59,61,63,65-66,69-71,77-78,80,84 1. Calculate the concentration of an aqueous HNO solution that has a pH of 2.45. 2. The på, of hypochlorous acid (HOCI) is 7.53. (a) Calculate the K. of HOCI. Given that the pk, of hypobromous acid (HOBr) is 8.63, which acid is stronger, and how do you know? (b) Write the reaction (with physical states)...
Chem. 18 wa t H Summary Name LONG 11/20/19 to 1. What is the pH of...
Chem. 18 wa t H Summary Name LONG 11/20/19 to 1. What is the pH of pure water toe 25 and 100C oc pth log (12 log 115wo 7.47 250hL 100 2. IHI 4.3, what is the pow at Cat C and at 100C OH43 PP24 Ans. 75,7.6.11 100°C pelas 53 -613 As 2 - 3. What is the pH of 0.01M H O.1MHNO, 10M HCL 1M HCIO: 0.0040M HCI? 4. What is the pH of 0.015M NOH; 0.25MKOH 5.0x10'...
help 5/5 Which of these neutralization reactions has a pH >7 when equal molar amounts of...
help
5/5 Which of these neutralization reactions has a pH >7 when equal molar amounts of acid and base are mixed? A) HC2H:02 (aq) + LiOH(aq) = H2O(l) + LiC,H,O, (aq) B) HI(aq) + NH3(aq) = NHI (aq) C) HI (aq) + KOH(aq) = H2O(l) + Kl(aq) D) HCl (aq) + NH3(aq) = NHACI (aq) . Which of these neutralization reactions has a pH <7 when equal molar amounts of acid and base are mixed? A) HC H302 (aq) +...
5) Of the following acids, ________ is a strong acid. A) HNO2 B) H2CO3 C) HNO3...
5) Of the following acids, ________ is a strong acid. A) HNO2 B) H2CO3 C) HNO3 D) HClO 6) Calculate the hydrogen ion concentration in a solution of iced tea with lemon having a pH of 2.87. A) 2.9 x 10–2 M C) 1.3 x 10–3 M 7) Which one of the following is the weakest acid? A) HF (Ka = 6.8 × 10-4) B) HClO (Ka = 3.0 × 10-8) C) HNO2 (Ka = 4.5 × 10-4) D) HCN...
This Question: 1pl 7 ct 30 (1 compete) This Test: 30 pts possible o The probability...
This Question: 1pl 7 ct 30 (1 compete) This Test: 30 pts possible o The probability cuntomet of M. Moody's Bookstores a credit card to complete a purchase is Sex What is the probability at last 11 of the road condomers will be a credit card to complete a purchase? (Pound to the nearest Both of a percent) OA 74% OB. 58 Oc 1600 OD 252 O E 412 Type here to 4 3 9 8 7 5 T R...
1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2...
1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2. If a buffer solution is 0.200 M in a weak base (?b=5.0×10−5) and 0.530 M in its conjugate acid, what is the ph 3. Phosphoric acid is a triprotic acid (?a1=6.9×10−3, ?a2=6.2×10−8 , and ?a3=4.8×10−13 To find the pH of a buffer composed of H2PO4 - (aq) ) and HPO4 2− (aq) , which...
In a solution buffered to pH 3.443 that contains benzoic acid, propanoic acid, formic acid, and hydrazoic acid, wh...
In a solution buffered to pH 3.443 that contains benzoic acid, propanoic acid, formic acid, and hydrazoic acid, what percent of hydrazoic acid is protonated? Use the acid dissociation constants (K) in this table to answer the question. percentage protonated: Acids Acid Formula Tonization Constant 1.8x10-5 CH3COOH HAO 5.5x10-3 Benzoic Boric Butanoic CHECOOH 6.3x10-5 MyB03 5.4x10-10 C3H2COOH 1.5x10-5 H2CO3 Kat 4.510-7 4.7 10-11 Carbonic Bases Base Formula Ionization Constant ko Ammonia NH3 1.8x10-5 Methylamine CH NH? S.0x10-4 Dimethylamine (CH3)NH 5.4x10-4...
I need help with #3, 4. Also, I am confused with #5 because both pH are...
I need help with #3, 4. Also, I am confused with #5
because both pH are the same.
Ka 1-7X10 4 3. In a titration between HCHO, and KOH, would the pH at the equivalence point be acidic, basic, or neutral? Briefly explain your answer. HCHO+KOH b) Which of the following acid-base indicators would be the best one to use in the titration? i) methyl orange, Ka = 104 ii) bromthymol blue, Ka = 10-7 iii) thymolphthalein, Ka= 10-10 4....
14. Calculate the pH of 26 x 102 M KOH. (1) 1241 (2)1550 (3)208 47 15....
14. Calculate the pH of 26 x 102 M KOH. (1) 1241 (2)1550 (3)208 47 15. Calculate the H* ion cancentration in lemon juice having a pH of 2 40 (1)401 00 59 4.0-10-ง M (2) 250 M the [H'] in offee than in neutral water? manganese(l) cartonate (MncO] is 42x 10 M. What is Kap for this oompound? (3) 0.38 M 440x0M 16. The pH of coffee is approximately 5.0. How mamy times groater is (1) 200 (2) 100...
Help please and show all work!
2. The pk, of hypochlorous acid (HOCI) is 7.53. (a) Calculate the k. of HOCI. Given that the pk, of hypobromous acid (HOBr) is 8.63, which acid is stronger, and how do you know? (b) Write the reaction (with physical states) that corresponds to the K, of HOCI. Identify the weak acid among the reactants (label it WA) and its conjugate base among the products (label it CB). (c) Calculate [H30*] (or "[H]") and...
Problem Set 15 CHEM 1252 November 10, 2019 Textbook Reading Assignment: 15.5-8 [and see App. 5 for Kor k, values] Additional Practice Problems: 15.51,57,59,61,63,65-66,69-71,77-78,80,84 1. Calculate the concentration of an aqueous HNO solution that has a pH of 2.45. 2. The på, of hypochlorous acid (HOCI) is 7.53. (a) Calculate the K. of HOCI. Given that the pk, of hypobromous acid (HOBr) is 8.63, which acid is stronger, and how do you know? (b) Write the reaction (with physical states)...
Chem. 18 wa t H Summary Name LONG 11/20/19 to 1. What is the pH of pure water toe 25 and 100C oc pth log (12 log 115wo 7.47 250hL 100 2. IHI 4.3, what is the pow at Cat C and at 100C OH43 PP24 Ans. 75,7.6.11 100°C pelas 53 -613 As 2 - 3. What is the pH of 0.01M H O.1MHNO, 10M HCL 1M HCIO: 0.0040M HCI? 4. What is the pH of 0.015M NOH; 0.25MKOH 5.0x10'...
help
5/5 Which of these neutralization reactions has a pH >7 when equal molar amounts of acid and base are mixed? A) HC2H:02 (aq) + LiOH(aq) = H2O(l) + LiC,H,O, (aq) B) HI(aq) + NH3(aq) = NHI (aq) C) HI (aq) + KOH(aq) = H2O(l) + Kl(aq) D) HCl (aq) + NH3(aq) = NHACI (aq) . Which of these neutralization reactions has a pH <7 when equal molar amounts of acid and base are mixed? A) HC H302 (aq) +...
This Question: 1pl 7 ct 30 (1 compete) This Test: 30 pts possible o The probability cuntomet of M. Moody's Bookstores a credit card to complete a purchase is Sex What is the probability at last 11 of the road condomers will be a credit card to complete a purchase? (Pound to the nearest Both of a percent) OA 74% OB. 58 Oc 1600 OD 252 O E 412 Type here to 4 3 9 8 7 5 T R...
In a solution buffered to pH 3.443 that contains benzoic acid, propanoic acid, formic acid, and hydrazoic acid, what percent of hydrazoic acid is protonated? Use the acid dissociation constants (K) in this table to answer the question. percentage protonated: Acids Acid Formula Tonization Constant 1.8x10-5 CH3COOH HAO 5.5x10-3 Benzoic Boric Butanoic CHECOOH 6.3x10-5 MyB03 5.4x10-10 C3H2COOH 1.5x10-5 H2CO3 Kat 4.510-7 4.7 10-11 Carbonic Bases Base Formula Ionization Constant ko Ammonia NH3 1.8x10-5 Methylamine CH NH? S.0x10-4 Dimethylamine (CH3)NH 5.4x10-4...
I need help with #3, 4. Also, I am confused with #5
because both pH are the same.
Ka 1-7X10 4 3. In a titration between HCHO, and KOH, would the pH at the equivalence point be acidic, basic, or neutral? Briefly explain your answer. HCHO+KOH b) Which of the following acid-base indicators would be the best one to use in the titration? i) methyl orange, Ka = 104 ii) bromthymol blue, Ka = 10-7 iii) thymolphthalein, Ka= 10-10 4....
14. Calculate the pH of 26 x 102 M KOH. (1) 1241 (2)1550 (3)208 47 15. Calculate the H* ion cancentration in lemon juice having a pH of 2 40 (1)401 00 59 4.0-10-ง M (2) 250 M the [H'] in offee than in neutral water? manganese(l) cartonate (MncO] is 42x 10 M. What is Kap for this oompound? (3) 0.38 M 440x0M 16. The pH of coffee is approximately 5.0. How mamy times groater is (1) 200 (2) 100...
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