100 mL of 0.50 M $H X_{2} SO X_{4}$ is mixed with 400 mL of 0.30 M NaOH (volumes additive, complete neutralisation of H+ by OH-). Which statements are correct?

AFinal $[SO X_{4} X^{2 -}] = 0.20 M$
BThe final solution is basic
CFinal $[OH X^{-}] = 0.040 M$
DFinal $[Na X^{+}] = 0.24 M$

Answer: B, C, D

H+ = 100 x 0.50 x 2 = 100 mmol; OH- = 120 mmol, so OH- is in excess by 20 mmol and the solution is basic. [OH-] = 20/500 = 0.040 M. Na+ = 120/500 = 0.24 M. Sulphate = 50/500 = 0.10 M, so 0.20 is false.

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100 mL of 0.50 M HX2​SOX4​ is mixed with 400 mL of 0.30 M NaOH (volumes additive, complete neutralisation of H+ by OH-). Which statements are correct?

Answer: B, C, D

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100 mL of 0.50 M $H X_{2} SO X_{4}$ is mixed with 400 mL of 0.30 M NaOH (volumes additive, complete neutralisation of H+ by OH-). Which statements are correct?