Find the pH of each solution: 1. 30mL of 0.1M K2HPO4 mixed with 10mL of 0.1M...
Find the pH of each solution:
1. 30mL of 0.1M K2HPO4 mixed with 10mL of 0.1M KH2PO4 and 60mL of water;
2. 10mL of 0.1M K2HPO4 mixed with 30mL of 0.1M KH2PO4 and 60mL of water;
| Phosphoric acid, H3PO4 | 1st Ka&pKa | 7.1 x 10-3 | 2.15 |
| 2nd Ka&pKa | 6.3 x 10-8 | 7.20 | |
| 3rd Ka&pKa | 4.5 x 10-13 | 12.35 |
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Find the pH of each solution:
1. 30mL of 0.1M K2HPO4 mixed with 10mL of 0.1M...
Prepare 2 liter of 0.1 M potassium phosphate buffer, pH = 7.5. Use the Henderson-Hasselbalch equation...
Prepare 2 liter of 0.1 M potassium phosphate buffer, pH = 7.5. Use the Henderson-Hasselbalch equation to calculate the amounts required of the relevant chemicals. Assume the pKa2 of H3PO4 is 7.2. The buffer can be prepared in any one of several ways. (2) Start with KH2PO4 (solid) and convert a portion of it to K2HPO4 by adding KOH. Ką and pK, for Polyprotic Acids Acid Name Ка pK Phosphoric acid, H3PO4 2.15 1st 2nd 3rd 7.1 x 10-3 6.3...
1) 10ml of 0.1M Nitric Acid is added to 20ml of 0.2M Sulfuric (H2SO4) and then...
1) 10ml of 0.1M Nitric Acid is added to 20ml of 0.2M Sulfuric (H2SO4) and then diluted up to 100 ml, what is the resulting pH? Hint: Recall [H3O+] = total moles of [H+]/total Volume 2) Which of the following acid solutions is the MOST acidic? (careful it’s a mix of concentrations as well as Ka and pKa) a) 1.0M Phenol, Ka = 1.3 x 10-10 b) 0.08M Pyruvic acid, pKa = 2.76 c) 0.1M Bromo-Acetic acid pKa =...
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6. What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give...
6. What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL? The Ka2 for dihydrogen phosphate is 6.2 x 10-8 and the equilibrium reaction of interest is H2PO4 (4) + H20 <-> H30* ( HPO4 (4) 7. Determine the pH of a 0.188 M NH3 solution at 25°C. The Kh of NH3 is 1.76 x 10-5. 8. Calculate the pH of...
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1 A) Which of the following pairs of solutions when mixed will form a buffer solution?...
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Llulate sodium fluoride after the addition of 0.04 mol of HCl to 1 L. of this...
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What is the answer for 11, 12, and 14? and please show how you calculate it!...
What is the answer for 11, 12, and 14? and please show how you
calculate it!
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Prepare 2 liter of 0.1 M potassium phosphate buffer, pH = 7.5. Use the Henderson-Hasselbalch equation to calculate the amounts required of the relevant chemicals. Assume the pKa2 of H3PO4 is 7.2. The buffer can be prepared in any one of several ways. (2) Start with KH2PO4 (solid) and convert a portion of it to K2HPO4 by adding KOH. Ką and pK, for Polyprotic Acids Acid Name Ка pK Phosphoric acid, H3PO4 2.15 1st 2nd 3rd 7.1 x 10-3 6.3...
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What is the answer for 11, 12, and 14? and please show how you
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