(a) an aq. Solution of hydrogen peroxide H2O2 decomposes in the presence of a catalyst
According to the equation. 2H2O2 (aq)=> 2H2O (l) + O2 (g)
i)calculate the number of moles of H2O2 required to produce 10dm3 of oxygen gas measured at room temperature and pressure.?
ii)the number of moles calculated in a)i) is present in 1dm3 of H2O2 solution. Calculate the volume of this solution required to make 250cm3 of 0.100moldm^-3 solution by diluting with water?
b) when 20cm3 of the 0.100moldm^-3 solution of H2O2 was acidified with dilute sulphuric acid and titrated agaisnt a 0.020moldm^-3 solution of potassium manganate (vii) 40cm3 of latter were required for the complete reaction.
i) calculate the number of moles of KMnO4 in 40 cm3 of 0.020moldm^-3 solution?
ii) calculate the number of moles of H2O2 in 20cm3 of 0.100moldm^-3 solution
iii) hence deduce the number of moles of H2O2 which react with 1 mol of KMnO4 ?
(iv) Use the result from (b)iii) to balance the following equation for the reaction taking place in titration. Use whole numbers.
KMnO4 + H2O2+ H2SO4 ===> MnSO4 + K2SO4 + H2O + O2
According to the equation. 2H2O2 (aq)=> 2H2O (l) + O2 (g)
i)calculate the number of moles of H2O2 required to produce 10dm3 of oxygen gas measured at room temperature and pressure.?
ii)the number of moles calculated in a)i) is present in 1dm3 of H2O2 solution. Calculate the volume of this solution required to make 250cm3 of 0.100moldm^-3 solution by diluting with water?
b) when 20cm3 of the 0.100moldm^-3 solution of H2O2 was acidified with dilute sulphuric acid and titrated agaisnt a 0.020moldm^-3 solution of potassium manganate (vii) 40cm3 of latter were required for the complete reaction.
i) calculate the number of moles of KMnO4 in 40 cm3 of 0.020moldm^-3 solution?
ii) calculate the number of moles of H2O2 in 20cm3 of 0.100moldm^-3 solution
iii) hence deduce the number of moles of H2O2 which react with 1 mol of KMnO4 ?
(iv) Use the result from (b)iii) to balance the following equation for the reaction taking place in titration. Use whole numbers.
KMnO4 + H2O2+ H2SO4 ===> MnSO4 + K2SO4 + H2O + O2