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...
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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
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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...
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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...
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Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of...
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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. 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
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Question 4 (1 point) Saved How many equivalents of NaOH base would you expect to add to phosphoric acid when adjusting the pH to 6.82 ? Hint: pKa values are in the notes 0.5 1.5 2.5 o 1.0 2.0 Question 6 (1 point) Citric acid is a triprotic acid with three carboxylic acid groups having pK,values of 3.1,4.8, and 64. If a solution of citric acid has a predominantly means greater then 50% pH of...
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...
EQUL 499- Det. Of pH of Strong Acid, weak acid, salt, and buffer solution Discussion Topics Discussion Topics (need to submit in Blackboard): 1. What is a buffer? • A buffer is a solution that, when introduced to a new environment, undergoes minimal pH change, typically when adding acidic or basic solutions. These are extremely important for life because the pH of human blood is delicate and even if it is changed by 0.1, there may be catastrophic effects. 2....
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...
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...
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