Homework Answers
Solution
D) At point E the charge on citric acid would be -2
E) Overall reaction is
3NAOH + CITRIC ACID -> 3H2O + C6H5O7(3-)
Now moles of NAOH at point E assuming the value of NAOH consumed is equal to 50ml from the graph.
Moles of NAOH = 50*0.1 = 5 milli moles
Limiting Reagent is NAOH, moles of CITRIC acid that will be consumed are 5/3
Moles of CITRIC ACID left will be (2-5/3)milli moles
Concentration of Citric acid = 1/3÷(70) = 1/210. , 70(20 citric acid + 50 NAOH) is the total volume.
From PKa3 we get Ka3 = 10^(-6.4) which is equal to
10^(-6.4) = [H+][C6H5O7(3-)]÷(1/210)
From here we get [H+] = 4.353*10^(-5)
And since PH = -log[H+]
So pH = 4.36
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2. Soda has a pH between 3 and 4. Soda makers often add citric acid to give a tart taste to soda....
2. Soda has a pH between 3 and 4. Soda makers often add citric acid to give a tart taste to soda....
2. Soda has a pH between 3 and 4. Soda makers often add citric acid to give a tart taste to soda. 20 ml of 0.1 M citric acid (H 3C6H57, pa 3.1, pKa2 4.7, pKa3 6.4) is titrated with 0.1 M NaOH a2 4.7, pka3 6.4) is titrated pH 0 10 20 30 40 50 60 volume of NaOH Citric acid can be used as a buffer. The formula and charge of citric acid (H3CsH5o7, H2C6Hso, HCGH,o, CH3) depends...
Show all work 2. (8 points) Citric acid (CH,O(COOH)3) is a triprotic acid with Ka values...
Show all work
2. (8 points) Citric acid (CH,O(COOH)3) is a triprotic acid with Ka values of 7.44x 10-, 1.73 × 10-5 and 4.02 × 10-7. For a 0.15 M solution of citric acid at pH 6.4, what are the predominant species? O C3H O(COOH)3 and C,H, O(COOH) COO 0 C,H50(COOH)2C00 ○ C3H50(COOH)2C00-and C3H,OC00H (COO-)2 。C3HsOCOOH(COO-)2 and C3H50(COO-)s
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...
15. A 66 mL sample of a solution of sulfuric acid, H,SO, is neutralized by 34...
15. A 66 mL sample of a solution of sulfuric acid, H,SO, is neutralized by 34 mL of a 0.13 M sodium hydroxide solution. Calculate the molarity of the sulfuric acid solution 16. If 300 mL of 3.9 M HCl is added to 400 mL of 2.9 M NaOH, what is the pH? 17. If 287 mL of 4.7 M HCl solution is added to 284 mL of 3.2 M Ba(OH), solution, what will the pH be? 18. What is...
you. 12e) phenolphthalein (color change between pH-8-10), bromocresol green color change between pH 3-4) are provided...
you. 12e) phenolphthalein (color change between pH-8-10), bromocresol green color change between pH 3-4) are provided to pH change at point of Proposed indicator inflection titration between HCl and 1 to 11 NaOH 12d) Calculate the pH of the solution when 10 mL of 0.1 M NaOH is added to 25 mL 0.1 M HCI .Write appropriate chemical equations if required and show your math!!!(4 points) In the ICE table started for calculating equilibrium concentrations of the reaction shown, the...
Pls help on filling out Tritraion of a Polyprotic acid chart Data from lab Titration #1...
Pls help on filling out Tritraion of a Polyprotic acid chart
Data from lab
Titration #1
Titration #2
Titration #3
mL base added
pH
mL base added
pH
mL base added
pH
1
0.7
1
0.7
1
0.7
2
1.1
2
1
2
0.9
3
1.5
3
1.4
3
1.3
4
1.7
4
1.6
4
1.5
5
1.9
5
1.8
5
1.7
6
2
6
2.1
6
2
7
2.2
7
2.2
7
2.2
8
2.4
8
2.3
8
2.2...
Suppose 1.00 g of NaOH is used to prepare 250 mL of an NaOH solution. Compare...
Suppose 1.00 g of NaOH is used to prepare 250 mL of an NaOH solution. Compare the expected molarity of this solution to the actual average molarity you measured in the standardization. What do you notice? Do you think the results would have been more accurate if a different type of acid or base were used in the standardization? Why, or why not? There are many different primary standards that could be used in a standardization titration. What are the...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of unknown (8) 0.175 0.120 0.122 Initial buret reading (mL) 0.00 22.37 0.00 Final buret reading (mL) 22.37 44.85 22.83 Volume of NaOH added (mL) 22.37 22.48 22.83 We will assume that the data collected for the first trial is not accurate. 7. What is the average mass of unknown acid for Trials 2 and 3? (Must show calculations) 8. What is the average volume...
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...
Titration: Acids and Bases 2. How can you determine which acid is diprotic? 3. using the...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
Acid Volume Base Base Initial Volume (mL) Base Final Volume (mL) Volume of Base Used (mL) Acid: Base Ratio Acid 1 20 mL Base 1 50 mL 34.5 15.5 4:3 Acid 2 20 mL Base 1 Acid 1 20 mL Base 2 Acid 2 20...
2. Soda has a pH between 3 and 4. Soda makers often add citric acid to give a tart taste to soda. 20 ml of 0.1 M citric acid (H 3C6H57, pa 3.1, pKa2 4.7, pKa3 6.4) is titrated with 0.1 M NaOH a2 4.7, pka3 6.4) is titrated pH 0 10 20 30 40 50 60 volume of NaOH Citric acid can be used as a buffer. The formula and charge of citric acid (H3CsH5o7, H2C6Hso, HCGH,o, CH3) depends...
Show all work
2. (8 points) Citric acid (CH,O(COOH)3) is a triprotic acid with Ka values of 7.44x 10-, 1.73 × 10-5 and 4.02 × 10-7. For a 0.15 M solution of citric acid at pH 6.4, what are the predominant species? O C3H O(COOH)3 and C,H, O(COOH) COO 0 C,H50(COOH)2C00 ○ C3H50(COOH)2C00-and C3H,OC00H (COO-)2 。C3HsOCOOH(COO-)2 and C3H50(COO-)s
15. A 66 mL sample of a solution of sulfuric acid, H,SO, is neutralized by 34 mL of a 0.13 M sodium hydroxide solution. Calculate the molarity of the sulfuric acid solution 16. If 300 mL of 3.9 M HCl is added to 400 mL of 2.9 M NaOH, what is the pH? 17. If 287 mL of 4.7 M HCl solution is added to 284 mL of 3.2 M Ba(OH), solution, what will the pH be? 18. What is...
you. 12e) phenolphthalein (color change between pH-8-10), bromocresol green color change between pH 3-4) are provided to pH change at point of Proposed indicator inflection titration between HCl and 1 to 11 NaOH 12d) Calculate the pH of the solution when 10 mL of 0.1 M NaOH is added to 25 mL 0.1 M HCI .Write appropriate chemical equations if required and show your math!!!(4 points) In the ICE table started for calculating equilibrium concentrations of the reaction shown, the...
Pls help on filling out Tritraion of a Polyprotic acid chart
Data from lab
Titration #1
Titration #2
Titration #3
mL base added
pH
mL base added
pH
mL base added
pH
1
0.7
1
0.7
1
0.7
2
1.1
2
1
2
0.9
3
1.5
3
1.4
3
1.3
4
1.7
4
1.6
4
1.5
5
1.9
5
1.8
5
1.7
6
2
6
2.1
6
2
7
2.2
7
2.2
7
2.2
8
2.4
8
2.3
8
2.2...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of unknown (8) 0.175 0.120 0.122 Initial buret reading (mL) 0.00 22.37 0.00 Final buret reading (mL) 22.37 44.85 22.83 Volume of NaOH added (mL) 22.37 22.48 22.83 We will assume that the data collected for the first trial is not accurate. 7. What is the average mass of unknown acid for Trials 2 and 3? (Must show calculations) 8. What is the average volume...
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...
Titration: Acids and Bases
2. How can you determine which acid is diprotic?
3. using the answers to questions one and two, which acid is
diprotic?
4. Which base has more hydroxide ions per molecule?
Acid Volume Base Base Initial Volume (mL) Base Final Volume (mL) Volume of Base Used (mL) Acid: Base Ratio Acid 1 20 mL Base 1 50 mL 34.5 15.5 4:3 Acid 2 20 mL Base 1 Acid 1 20 mL Base 2 Acid 2 20...
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