19.96 gm of disodium-diperoxyborate when dissolved in 100 ml of excess dilute H 2 SO 4 , the volume strength of the solution become 22.4 volume. How many hydroxyl groups are present in the one molecule of disodium diperoxyborate ? At wt : Na – 23; O – 16; B – 10.8
Text Solution
Verified by Experts4
0004
Sol. In the acidified solution, each mole of sodium diperoxyborate yields 2 moles of H 2 O 2
sodium diperoxyborate + dil H 2 SO 4 — → 2 moles H 2 O 2
2 × 
mol
∴ Molarity of H 2 O 2 = 20 × 
(M)
∴ Volume strength of H 2 O 2 solution
= 11.2 × 20 × 
volume
= 22.4
or M = 
= 199.6
Let number of OH groups present in one molecule of sodium di peroxy borate = x
∴ 2 × 23 + x × 17 + 2 × 32 + 2 × 10.8 = 199.6
or x = 4 Ans. 4
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