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Acidic oxide of period 3 means its either A, C, DX is the oxide of a Period 3 element. X reacts with water to give an acidic solution.
A solution is prepared by reacting 0.100g of X with excess water. This solution was neutralised
by exactly 25.0cm3
of 0.100moldm–3 sodium hydroxide solution.
What could be the identity of X?
A Al 2O3 B MgO C P4O10 D SO3
Need help with this
When so3 is dissolved in water it forms h2so4
H2so4 + 2naoh = na2so4 + 2h2o
note the mole ration of acid to base is 1: 2
Moles of naoh = concentration x volume
0.1 x 25/1000
= 2.5x10^-3
0.100g of x means that if its so3 then
mole = 0.100/16x3 +32
= 1.25x10^-3
which is exactly half
hence ans is D
hope it helps<3