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Find the molarity of Na2SO4 formed upon mixing of 0.2 M, 2 L H2SO4 and 0.1 M, 2 L Na OH.

(a) 0.05 M

(b) 0.03 M

(c) 0.04 M

(d) 0.025 M

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Correct option is (d) 0.025 M

∴ 2 moles of NaOH → 1 mole of Na2SO4

∴ 0.2 moles of NaOH → 0.2/2 =  0.1 moles of Na2SO4

M\(ka_2so_ 4\) = 0.1/4 = 0.025 M

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