Question

Calculate the slope of each solution .what does the slop correspond to? what are the unit of the slope?
solition1. V H2O2=5ml ; V KI=10ml rate (ml of oxygen /s)=?
solution 2. V H2O2=10V; KI=10ml rate (ml of oxygen /s)=?
Solution 3. VH2O2=5 ;V KI=20ml rate (ml of oxygen /s)=?

Answer 1

A balanced reaction of decomposition of H2O2 by KI is,

H2O2 + 2 I^- ----------> O2 + 2 HI.

I.e. 1 mole of H2O2 gives 1 mole of O2.

i.e. 'V' mL of H2O2 on decomposition will produce same volume of O2.

Hence we hhave following results.

1) Solution 1 Volume of H2O2 = 5.00 mL hence Volume of O2 = 5 mL.

Rate (volume of O2/ s) = 5 mL/s.

2) Solution 2 Volume of H2O2 = 10.00 mL hence Volume of O2 = 10 mL.

Rate (volume of O2/ s) = 10 mL/s.

3) Solution 3 Volume of H2O2 = 5.00 mL hence Volume of O2 = 5 mL.

Rate (volume of O2/ s) = 5 mL/s.

Volume of KI does not affect volume of O2 formed.

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