10 mL of 1 N HCl, 25 mL of 2 N `H_(2)SO_(4)` and 40 mL of X N `HNO_(3)` are mixed and made up to 2000 mL. 100 mL of this solution required 30 mL of NaOH taken from a solution containing 4 g of NaOH in 250 mL of solution. What is the value of X ?

10 mL of 1 N HCl, 25 mL of 2 N `H_(2)SO_(4)` and 40 mL of X N `HNO_(3)

1.	10 mL of 1 N HCl, 25 mL of 2 N `H_(2)SO_(4)` and 40 mL of X N `HNO_(3)` are mixed and made up to 2000 mL. 100 mL of this solution required 30 mL of NaOH taken from a solution containing 4 g of NaOH in 250 mL of solution. What is the value of X ?
Answer» Normality of NaOH `N_(1) = (4)/(10) xx (1000)/(250)` `N_(1) = 0.4 N` `:. N_(1) V_(1) = N_("mix") V_("mix")` `0.4 xx 30 = N_("mix") xx 100` `N_("mix") = 0.12 N` `((10 xx 1) + (25 xx 2) + (40 xx x))/(2000) = 0.12 N` `240 = 60 + 40x` `180 = 40x` `x = (180)/(40) = 4.5` `N_(HNO_(3)) = 4.5 N`