30.0 cm3 ^3\,3 of 0.300 mol dm−3^{-3}−3 HCl is added to 70.0 cm3 ^3\,3 of 0.100 mol dm−3^{-3}−3 NaOH.
What is the concentration of the resulting solution?
0.0200 mol dm−3^{-3}−3 HCl and 0.0200 mol dm−3^{-3}−3 NaCl
0.0200 mol dm−3^{-3}−3 HCl and 0.0700 mol dm−3^{-3}−3 NaCl
0.0700 mol dm−3^{-3}−3 HCl and 0.0200 mol dm−3^{-3}−3 NaCl
0.0900 mol dm−3^{-3}−3 HCl and 0.0700 mol dm−3^{-3}−3 NaCl