Answer / jyoti temkar

Actual strength of commercial HCl is 36%.
Molecular wt of HCl is 36.5
Density is 1.18 g/ml
So wt of HCl for 1 M is 36.5/(36/100) for 1000 ml
As volume = mass/ density,
Volume of HCl for 1M Strength in 1000 ml will be
36.5*100/(36*1.18)
=89 ml

Answer / abcd

since we r using fuming hcl ,so that the strength of the acid decrease while open it to atmosphere, so that we take 89 ml instead of 85 ml.

Answer / abcd

since we r using fuming HCl , so that the strength of the acid decreases if we kept open the acid to atmosphere ,so that we take 89 ml instead of 85 ml.

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