1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) with 72 g of sodium benzoate and then 300 mL 1.0 M HBr solution was added. The pH of final solution is :
Sahay Sir > Question Answers > 1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) with 72 g of sodium benzoate and then 300 mL 1.0 M HBr solution was added. The pH of final solution is :
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 [...]
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 [...]
Ka for the reaction; Fe^3 + (aq.)+H2O(l) ⇌ Fe(OH)^2 + (aq.)+H3O^+ (aq.) is 6.5×10^−3 . What is the maximum pH value which could be used do that at least 80% of the total ion (III) in a dilute solution exists as Fe^3+ ?
22
Nov
Ka for the reaction; Fe^3 + (aq.)+H2O(l) ⇌ Fe(OH)^2 + (aq.)+H3O^+ (aq.) is 6.5×10^−3 . What is the maximum pH value which could be used do that at least 80% of the total ion (III) in a dilute solution exists as Fe^3+ ? 1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) [...]
1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) with 72 g of sodium benzoate and then 300 mL 1.0 M HBr solution was added. The pH of final solution is :
22
Nov
1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) with 72 g of sodium benzoate and then 300 mL 1.0 M HBr solution was added. The pH of final solution is : 1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) with 72 g of sodium benzoate and then [...]