A 5.0 cm 3 solution of H 2 O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H 2 O 2 solution in terms of volume strength at STP.

Question

Jitender Pal · Answer

H 2 O 2 + H 2 SO 4 + 2KI &rarr; K 2 SO 4 + I 2 +2H 2 O 34 gm Acidified 254 gm 3 KI sol 0.508 gm 5 cm 3 or ml i.e. 254 gm of I 2 is released by 34 gm H&shy; 2 O 2 &there4; 0.508 gm of I 2 will be released by = 34/254 * 0.508 = 0.608 5 ml of H 2 O 2 sol. Contains 0.068 gm of H 2 O 2 &there4; 1 ml of H 2 O 2 contains 0.068/5 gm H 2 O 2 NOTE : The strength of H 2 O 2 is generally calculate in terms of volume strength. According to which 10 volume of H 2 O 2 means that 1 ml of H 2 O 2 sol gives 10 ml of O 2 at STP. 2H 2 O 2 &rarr; 2H 2 O + O 2 2*34 gm 32 gm or 22,400 ml at STP i.e., 68 gm of H 2 O 2 gives 22, 400 ml of O 2 at STP or 1 ml of H 2 O 2 sol or 0.068/5 gm of H 2 O 2 sol gives 4.48 ml of O 2 i.e. strength of H 2 O 2 sol is 4.48 volumes

Jitender Pal · Answer

Hello Student,

Please find the answer to your question

H₂O₂	+ H₂SO₄	+	2KI	→	K₂SO₄	+	I₂	+2H₂O
34 gm			Acidified				254 gm
3			KI sol				0.508 gm
5 cm³ or ml

i.e. 254 gm of I₂ is released by 34 gm H₂O₂

∴ 0.508 gm of I₂ will be released by

= 34/254 * 0.508 = 0.608

5 ml of H₂O₂ sol. Contains 0.068 gm of H₂O₂

∴ 1 ml of H₂O₂contains 0.068/5 gm H₂O₂

NOTE : The strength of H₂O₂ is generally calculate in terms of volume strength. According to which 10 volume of H₂O₂ means that 1 ml of H₂O₂ sol gives 10 ml of O₂ at STP.

2H₂O₂ → 2H₂O + O₂

2*34 gm 32 gm or

22,400 ml at STP

i.e., 68 gm of H₂O₂gives 22, 400 ml of O₂ at STP or 1 ml of H₂O₂ sol

or 0.068/5 gm of H₂O₂ sol gives 4.48 ml of O₂ i.e. strength of H₂O₂ sol is 4.48 volumes

Thanks
jitender
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A 5.0 cm 3 solution of H 2 O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H 2 O 2 solution in terms of volume strength at STP.

A 5.0 cm³ solution of H₂O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H₂O₂ solution in terms of volume strength at STP.

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A 5.0 cm 3 solution of H 2 O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H 2 O 2 solution in terms of volume strength at STP.

A 5.0 cm3 solution of H2O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H2O2 solution in terms of volume strength at STP.

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A 5.0 cm³ solution of H₂O liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H₂O₂ solution in terms of volume strength at STP.