1 What volume of 025 M HNO3 aq reacts with 48 ml of 0150 M N

1) What volume of 0.25 M HNO3 (aq) reacts with 4.8 ml of 0.150 M Na2CO3 (aq) when the two solutions are mixed?please show work step by step.

2)A solution of hydrogen peroxide, H2O2, Is titrated with a solution of potassium permanganate, KMnO4. The reaction is

5H2O2(aq) + 2KMnO4 (aq) ?5O2 (g) + 2MnSO4 (aq) +K2SO4 (aq) + 8H2) (l)

It requires 51.7 mL of 0.145 M KMNO4 to titrate 20.0 grams of the solution of hydrogen peroxide. What it the mass percentage of H2O2 in the solution. Please show work step by step.

Solution

molecular weight of H2O2=2+32=34

no .o fmoles of H2O2=20/34=0.588 moles

according to eqn 5 moles of H2O2 react with 2 moleds of KMnO4

so one mole of H2O2 ract with 2/5 moles of KMnO4

so 0.588 moles react with 0.588*(2/5)=0.2352 moles of KmnO4

weight of this no. of moles=0.2352*158=37.166

Total weight of solution=20+37.166=57.166

Weight % of H2O2=20/57.166 *100=34.98%