An aqueous solution of 0.100 M phosphoric acid (12.0 mL) is titrated with 0.400 M KOH as shown below. phosphoric acid has three pKas: 2.148, 7.198, 12.375.
H3PO4(aq) + OH-(aq) 
H2PO4-(aq) +
H2O(l)
H2PO4-(aq) + OH-(aq)
HPO42-(aq) +
H2O(l)
HPO42-(aq) + OH-(aq)
PO43-(aq) + H2O(l)
Calculate the pH of phosphoric acid solution before any KOH has been added.
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An aqueous solution of 0.100 M phosphoric acid (12.0 mL) is
titrated with 0.400 M KOH...
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH....
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH. What is the concentration of the acid? H3PO4 (aq) + 3 KOH(aq) - K3PO4 (aq) + 3 H2O) Initial volume of KOH solution 1.03 mL Final volume of KOH solution 15.02 mL Original volume of H3PO4 solution 24.68 mL O 0.001260M 0.05104 M 0.1531 M 0.4593M
H3PO4 is a triprotic weak acid. What is the balanced equilibrium defined as Ka2 of H3PO4?...
H3PO4 is a triprotic weak acid. What is the balanced equilibrium defined as Ka2 of H3PO4? O H2PO4 (aq) + H2O(l) =H2O*(aq) +HPO42- (aq) HPO42- (aq) + H2O(1) = OH(aq) + H2PO4 (aq) O HPO42-(aq) + H2O(1) =H20*(aq) + PO43-(aq) O H2PO4 (aq) + H2O(l) = OH" (aq) + H3PO4(aq) O H3PO.(aq) + H2O(1) =H30*(aq) + H2PO4 (aq)
QUESTION 1 Phosphoric acid, H3PO 4. Will undergo three successive ionization reactions to varying extents in...
QUESTION 1 Phosphoric acid, H3PO 4. Will undergo three successive ionization reactions to varying extents in water. What is the balanced equilibrium identified as Ka32 A H2PO4"(aq) + H200) H30(aq) + HPO42-a) B. HPO42-(aq) + H200 = PO43-10q) +H30*(aq) CH3PO4(aq) + H200) — H30*0q) + H2PO4 (aq) D. H2PO4" (09) + H30*(9) — H3PO4(aq) + H2010 E. PO43-(09) + H200) — HPO42-(aq) + OH(aq)
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH....
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH. What is the concentration of the acid? H3PO4 (aq) + 3 KOH(aq) – K3PO4 (aq) + 3 H200) Initial volume of KOH solution 1.03 mL Final volume of KOH solution 15.02 ml Original volume of H3PO, solution 24.68 ml O 0.001260M 0.4593 M 0.05104 M 0.1531M
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L...
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L sodium hydroxide solution. H3PO4 (aq) + NaOH ----> H2O (l) + Na3PO4 (aq) a) Balance the molecular equation and write the net ionic equation. b) calculate the molarity of phosphoric acid. c) calculate the mass percent of phosphoric acid in the water mixture (density = 1.50 g/mL)
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L...
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L sodium hydroxide solution. H3PO4 (aq) + NaOH ----> H2O (l) + Na3PO4 (aq) a) Balance the molecular equation and write the net ionic equation. b) calculate the molarity of phosphoric acid. c) calculate the mass percent of phosphoric acid in the water mixture (density = 1.50 g/mL)
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L...
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L sodium hydroxide solution. H3PO4 (aq) + NaOH --> H2O (1) + Na3PO4 (aq) a) Balance the molecular equation and write the net ionic equation. b) calculate the molarity of phosphoric acid. c) calculate the mass percent of phosphoric acid in the water mixture (density = 1.50 g/mL)
A 12.0 mL sulfuric acid solution, H_2SO_4(aq), was titrated using 0.250 M KOH. If the complete...
A 12.0 mL sulfuric acid solution, H_2SO_4(aq), was titrated using 0.250 M KOH. If the complete neutralization of the acid required 18.6 mL of the KOH solution, what was the molarity of sulfuric acid? Answer. 0.775 M
You are instructed to create 400. mL of a 0.40 M phosphate buffer with a pH...
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
A 15 ml aliquot of 1.00 M phosphoric acid is titrated with sodium hydroxide using phenolphthalein...
A 15 ml aliquot of 1.00 M phosphoric acid is titrated with sodium hydroxide using phenolphthalein as an indicator. If it takes 20.00 ml of sodium hydroxide to reach the endpoint, what is the molarity of the sodium hydroxide? Answer with appropriate significant digits. H3PO4 (aq) + NaOH (aq) --> H2O (l) + Na3PO4
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH. What is the concentration of the acid? H3PO4 (aq) + 3 KOH(aq) - K3PO4 (aq) + 3 H2O) Initial volume of KOH solution 1.03 mL Final volume of KOH solution 15.02 mL Original volume of H3PO4 solution 24.68 mL O 0.001260M 0.05104 M 0.1531 M 0.4593M
H3PO4 is a triprotic weak acid. What is the balanced equilibrium defined as Ka2 of H3PO4? O H2PO4 (aq) + H2O(l) =H2O*(aq) +HPO42- (aq) HPO42- (aq) + H2O(1) = OH(aq) + H2PO4 (aq) O HPO42-(aq) + H2O(1) =H20*(aq) + PO43-(aq) O H2PO4 (aq) + H2O(l) = OH" (aq) + H3PO4(aq) O H3PO.(aq) + H2O(1) =H30*(aq) + H2PO4 (aq)
QUESTION 1 Phosphoric acid, H3PO 4. Will undergo three successive ionization reactions to varying extents in water. What is the balanced equilibrium identified as Ka32 A H2PO4"(aq) + H200) H30(aq) + HPO42-a) B. HPO42-(aq) + H200 = PO43-10q) +H30*(aq) CH3PO4(aq) + H200) — H30*0q) + H2PO4 (aq) D. H2PO4" (09) + H30*(9) — H3PO4(aq) + H2010 E. PO43-(09) + H200) — HPO42-(aq) + OH(aq)
An unknown concentration of phosphoric acid is titrated to its equivalence point with 0.2701 M KOH. What is the concentration of the acid? H3PO4 (aq) + 3 KOH(aq) – K3PO4 (aq) + 3 H200) Initial volume of KOH solution 1.03 mL Final volume of KOH solution 15.02 ml Original volume of H3PO, solution 24.68 ml O 0.001260M 0.4593 M 0.05104 M 0.1531M
A 10.00 mL sample of phosphoric acid is titrated with 20.15 mL of a 2.50 mol/L sodium hydroxide solution. H3PO4 (aq) + NaOH --> H2O (1) + Na3PO4 (aq) a) Balance the molecular equation and write the net ionic equation. b) calculate the molarity of phosphoric acid. c) calculate the mass percent of phosphoric acid in the water mixture (density = 1.50 g/mL)
A 12.0 mL sulfuric acid solution, H_2SO_4(aq), was titrated using 0.250 M KOH. If the complete neutralization of the acid required 18.6 mL of the KOH solution, what was the molarity of sulfuric acid? Answer. 0.775 M
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
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