Mix 100 mL 0.2 M AOH with 100 mL 0.2 M BOH. K h ( A + ) = 1 0 − 8 , K a ( B + ) = 1 0 − 8 /9 , K w = 1 0 − 14 . Select correct statements.

Question

Mix 100 mL 0.2 M AOH with 100 mL 0.2 M BOH. K h ​ ( A + ) = 1 0 − 8 , K a ​ ( B + ) = 1 0 − 8 /9 , K w ​ = 1 0 − 14 . Select correct statements.

TestHub · Accepted Answer

After mixing, each base has formal concentration 0.1 M. K_b(AOH)=10⁻⁶ and K_b(BOH)=9×10⁻⁶. Common [OH⁻]≈√[0.1×10⁻⁵]=10⁻³ M, pH=11 rather than 3. Water's ionisation fraction≈10⁻¹¹/55.5=1.8×10⁻¹³, B. AOH fraction≈K_b/[OH⁻]=10⁻³, C. D disagrees with the common-ion result. Answer B,C.

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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