Citric Acid has 3 pKas: 3.13, 4.76, and 6.39. How many grams of sodium citrate monobasic...
Citric Acid has 3 pKas: 3.13, 4.76, and 6.39. How many grams of sodium citrate monobasic (HOC(COONa)(CH2COOH)2) and citric acid (HOC(COOH)(CH2COOH)2) are needed to make 300 mL of a 10 mM citrate buffer of exactly pH 2.8? The molecular weight of sodium citrate monobasic (NaH7C6O7) is 214.11 g/mol and that of citric acid (H8C6O7) is 192.12 g/mol.
Homework Answers
Solution will be acidic buffer ( combination of weak acid +
acid's salt with strong base).
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Citric Acid has 3 pKas: 3.13, 4.76, and 6.39. How many grams of
sodium citrate monobasic...
Calculate the molar ratio of citric acid and sodium citrate required to prepare 40mM buffer pH...
Calculate the molar ratio of citric acid and sodium citrate required to prepare 40mM buffer pH 4.8 citric acid pka= 3.13, 4.76, 6.39
A solution of sodium citrate (monobasic) is prepared to a formal concentration of 0.2 M. If...
A solution of sodium citrate (monobasic) is prepared to a formal concentration of 0.2 M. If the pKa's for the triprotic citric acid molecule are 3.13, 4.76, 6.40 what is the approximate pH of this solution?
1. What is the pH of a buffer solution prepared with a 0.4 M sodium citrate...
1. What is the pH of a buffer solution prepared with a 0.4 M sodium citrate and 1% citric acid (pka for citric acid - 3.13, MW - 192 g/mol)? 8. A buffer solution is prepared using 0.4 mole of a weakly basic drug (pka - 10.1) and an unknown quantity of its salt. The final solution has a pH of 8.99. How much of the salt was used? 9. A buffer solution with a desired pH of 8.15 needs...
29. A student has 200 mL of a buffer solution that consists of 0.700 M of citric acid and 0.500 M sodium citrate. W...
29. A student has 200 mL of a buffer solution that consists of 0.700 M of citric acid and 0.500 M sodium citrate. What is the pH of this solution? The pKal of citric acid is 3.06. 30. Give the formula and name of a metal hydroxide base.
How much citric acid (99% concentration; Molecular Weight:192.12; linear formula: HOC(COOH)(CH2COOH)2) do I need to add...
How much citric acid (99% concentration; Molecular Weight:192.12; linear formula: HOC(COOH)(CH2COOH)2) do I need to add to a lake (volume of lake:1233 cubic meters; m3) to lower the pH from 10.51 to 7. Lake Hardness: 412 mg/l CaCO3. Lake Alkalinity: 89.8 mg/L CaCO3.
4. How much of (in mL) 0.15 M acetic acid (pKa 4.76) is needed to mix...
4. How much of (in mL) 0.15 M acetic acid (pKa 4.76) is needed to mix with 40 mL of 0.15 M sodium acetate to make a buffer of pH = 4.50 of 250 mL? (molar mass of acetic acid and sodium acetate are 60.0 g/mol and 82.0 g/ml, pKa of acetic acid is 4.76) (extra 10 pt)
1. Please calculate the pH of a solution containing 2.0M citric acid and 1.0M sodium citrate....
1. Please calculate the pH of a solution containing 2.0M citric acid and 1.0M sodium citrate. 2. Please calculate the pH of a solution containing 1.0M tartaric acid and 1.OM potassium tartarate. 3. Please calculate the pH of a solution containing 0.25M CH NH, and 0.37M C.HNH,CI. 4. Please design a buffer system to maintain a pH of 7.20. 5. Please design a buffer system to maintain a pH of 3.70. 6. For each of the following solutions please calculate...
For the following problems, use the pK,' values given in Table 2-3 2-6 How many mL...
For the following problems, use the pK,' values given in Table 2-3 2-6 How many mL of 0.1 M sodium acetate should be added to 100 mL of 0.1M acetic acid to make a buffer of pH 5.1? What is the molarity of the resulting buffer with respect to acetate (acetate + acetic acid)? Table 2-2 The pKa Values of Common Buffers COMPOUND DK Oxalic 1.27 Histidine 1.82 Phosphoric 2.15 Glycine 2.35 Citric 3.13 Citric 4.76 4.76 Acetic Histidine 6.04...
4. Determine if the following commercial products are hypotonic, isotonic, or hypertonic: 0 1 L of...
4. Determine if the following commercial products are hypotonic, isotonic, or hypertonic: 0 1 L of a parenteral solution containing 20% w/v of mannitol (NaCleq = 0.18) o Fleets saline enema Contains: 19 grams of monobasic sodium phosphate (NaCleq = 0.49) 7 grams of dibasic sodium phosphate*7H20 (NaCleq = 0.29) in 120 mL of purified water solution ► What is the approximate pH of Fleets saline enema? Common Buffers Phosphate Buffer pka 6.8 Molecular Weight of Acid 120 g/mol Molecular...
Please show all steps. 17. Essay (20 pts) How many grams of salicylic acid (Mr =...
Please show all steps.
17. Essay (20 pts) How many grams of salicylic acid (Mr = 138 g/mol) and sodium salicylate (Mr = 160 g/mol) would you need to generate a 350 mM buffer system in 750 mL of water at pH 3.80? The pKa of salicylic acid is 2.97. What would be the new pH if you titrated this system with 25 mL of 0.1 M HCI?
1. What is the pH of a buffer solution prepared with a 0.4 M sodium citrate and 1% citric acid (pka for citric acid - 3.13, MW - 192 g/mol)? 8. A buffer solution is prepared using 0.4 mole of a weakly basic drug (pka - 10.1) and an unknown quantity of its salt. The final solution has a pH of 8.99. How much of the salt was used? 9. A buffer solution with a desired pH of 8.15 needs...
29. A student has 200 mL of a buffer solution that consists of 0.700 M of citric acid and 0.500 M sodium citrate. What is the pH of this solution? The pKal of citric acid is 3.06. 30. Give the formula and name of a metal hydroxide base.
4. How much of (in mL) 0.15 M acetic acid (pKa 4.76) is needed to mix with 40 mL of 0.15 M sodium acetate to make a buffer of pH = 4.50 of 250 mL? (molar mass of acetic acid and sodium acetate are 60.0 g/mol and 82.0 g/ml, pKa of acetic acid is 4.76) (extra 10 pt)
1. Please calculate the pH of a solution containing 2.0M citric acid and 1.0M sodium citrate. 2. Please calculate the pH of a solution containing 1.0M tartaric acid and 1.OM potassium tartarate. 3. Please calculate the pH of a solution containing 0.25M CH NH, and 0.37M C.HNH,CI. 4. Please design a buffer system to maintain a pH of 7.20. 5. Please design a buffer system to maintain a pH of 3.70. 6. For each of the following solutions please calculate...
For the following problems, use the pK,' values given in Table 2-3 2-6 How many mL of 0.1 M sodium acetate should be added to 100 mL of 0.1M acetic acid to make a buffer of pH 5.1? What is the molarity of the resulting buffer with respect to acetate (acetate + acetic acid)? Table 2-2 The pKa Values of Common Buffers COMPOUND DK Oxalic 1.27 Histidine 1.82 Phosphoric 2.15 Glycine 2.35 Citric 3.13 Citric 4.76 4.76 Acetic Histidine 6.04...
4. Determine if the following commercial products are hypotonic, isotonic, or hypertonic: 0 1 L of a parenteral solution containing 20% w/v of mannitol (NaCleq = 0.18) o Fleets saline enema Contains: 19 grams of monobasic sodium phosphate (NaCleq = 0.49) 7 grams of dibasic sodium phosphate*7H20 (NaCleq = 0.29) in 120 mL of purified water solution ► What is the approximate pH of Fleets saline enema? Common Buffers Phosphate Buffer pka 6.8 Molecular Weight of Acid 120 g/mol Molecular...
Please show all steps.
17. Essay (20 pts) How many grams of salicylic acid (Mr = 138 g/mol) and sodium salicylate (Mr = 160 g/mol) would you need to generate a 350 mM buffer system in 750 mL of water at pH 3.80? The pKa of salicylic acid is 2.97. What would be the new pH if you titrated this system with 25 mL of 0.1 M HCI?
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