1.

100 g of a sample of HClsolution of relative density 1.17 contains 33.4 g of HCl . What volume of this HCl solution will be required to neutralise exactly5 litres of N/10NaOH solution ?

Answer»

SOLUTION :Volume of HCl solution ` = 100/(1.17) mL `
`(" density " = ("mass")/("volume"))`
Equivalents of HCl = `(33.4)/(36.5)`
(eq.wt . Of HCl = 36.5)
m.e of HCl ` = (33.4)/(36.5) xx 1000 "" … (Eqn . 3)`
NORMALITY of HCl = `("m.e")/(" volume in mL") "" ....(Eqn .1)`
` =(33.4)/(36.5) xx 1000 xx (1.17)/100`
` = 10.7 ` N
Now let the volumeof HCl, of normality calculated above , REQUIRED to neutralise exactly the given NaOH solution be v mL .
Now let the volume of HCl , of normality calculated above , required to neutralise exactly the given ,naOH solution be v mL .
m.e of HCl = m.e of NaOH
`10.7 xx v = 1/10 xx 5000`
` 10 . 7xx v 1/10 xx 5000`
`10.7 xx v = 500`
` :. "" v = 46.7 mL `


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