Chapter 7 – Equilibrium
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In the titration of solution of a weak acid HA and NaOH, the pH is 5.0 after 10 mL of NaOH solution has been added and 5.60 after 20 mL NaOH has been added. What is the value of pKa for HA?
22
Nov
In the titration of solution of a weak acid HA and NaOH, the pH is 5.0 after 10 mL of NaOH solution has been added and 5.60 after 20 mL NaOH has been added. What is the value of pKa for HA? In the titration of solution of a weak acid HA and NaOH the [...]
Calculate approximate pH of the resultant solution formed by titration of 25 mL of 0.04 M Na2CO3 with 50 mL of 0.025 M HCl. [Given:pKa1=6.4 and pKa2 = 10.3 for H2CO3]
22
Nov
Calculate approximate pH of the resultant solution formed by titration of 25 mL of 0.04 M Na2CO3 with 50 mL of 0.025 M HCl. [Given:pKa1=6.4 and pKa2 = 10.3 for H2CO3] Calculate approximate pH of the resultant solution formed by titration of 25 mL of 0.04 M Na2CO3 with 50 mL of 0.025 M HCl. [...]
When a 20 mL of 0.08 M weak base BOH is titrated with 0.08 M HCl, the pH of the solution at the end point is 5. What will be the pOH if 10 mL of 0.04 M NaOH is added to the resulting solution? [Given : log2 = 0.30 and log3 = 0.48]
22
Nov
When a 20 mL of 0.08 M weak base BOH is titrated with 0.08 M HCl, the pH of the solution at the end point is 5. What will be the pOH if 10 mL of 0.04 M NaOH is added to the resulting solution? [Given : log2 = 0.30 and log3 = 0.48] the [...]
A solution of weak acid HA was titrated with base NaOH. The equivalent point was reached when 40 mL. Of 0.1 M NaOH has been added. Now 20 mL of 0.1 M HCl were added to titrated solution, the pH was found to be 5.0 What will be the pH of the solution obtained by mixing 20 mL of 0.2 M NaOH and 20 mL of 0.2 M HA?
22
Nov
A solution of weak acid HA was titrated with base NaOH. The equivalent point was reached when 40 mL. Of 0.1 M NaOH has been added. Now 20 mL of 0.1 M HCl were added to titrated solution, the pH was found to be 5.0 What will be the pH of the solution obtained by [...]
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A solution of weak acid HA was titrated with base NaOH. The equivalent point was reached when 40 mL. Of 0.1 M NaOH has been added. Now 20 mL of 0.1 M HCl were added to titrated solution ,
the pH was found to be 5.0 What will be the pH of the solution obtained by mixing 20 mL of 0.2 M NaOH and 20 mL of 0.2 M HA? ,
A buffer solution 0.04 M in Na2HPO4 and 0.02 in Na3PO4 is prepared. The electrolytic oxidation of 1.0 milli-mole of the organic compound RNHOH is carried out in 100 mL of the buffer. The reaction is RNHOH + H2O→RNO2+4H^+ +4e− The approximate pH of solution after the oxidation is complete is : [Given:forH3PO4,pKa1=2.2,pKa2=7.20,pKa3=12]
22
Nov
A buffer solution 0.04 M in Na2HPO4 and 0.02 in Na3PO4 is prepared. The electrolytic oxidation of 1.0 milli-mole of the organic compound RNHOH is carried out in 100 mL of the buffer. The reaction is RNHOH + H2O→RNO2+4H^+ +4e− The approximate pH of solution after the oxidation is complete is : [Given:forH3PO4,pKa1=2.2,pKa2=7.20,pKa3=12] 1.0 L [...]
Which of the following expression for % dissociation of a monoacidic base (BOH) in aqueous solution at appreciable concentration is not correct?
22
Nov
Which of the following expression for % dissociation of a monoacidic base (BOH) in aqueous solution at appreciable concentration is not correct? Which of the following expression for % dissociation of a monoacidic base (BOH) in aqueous solution at appreciable concentration is not correct? November 22, 2020 Category: Chapter 6 - Ionic Equilibrium (Level 1 [...]
A 1.025 g sample containing a weak acid HX (mol. Mass=82) is dissolved in 60 mL. water and titrated with 0.25 M NaOH. When half of the acid was neutralised the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Calculate mass percentage of HX in sample :
22
Nov
A 1.025 g sample containing a weak acid HX (mol. Mass=82) is dissolved in 60 mL. water and titrated with 0.25 M NaOH. When half of the acid was neutralised the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Calculate mass percentage of HX in sample : 1.0 [...]
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5]
22
Nov
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5] How many gm of solid KOH must be added to 100 mL of a buffer [...]
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5]
22
Nov
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5] How many gm of solid KOH must be added to 100 mL of a buffer [...]
Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution?
22
Nov
Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution? Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution? November 22, 2020 Category: Chapter 6 - Ionic Equilibrium [...]