1st Step) Write the balanced neutralisation reaction equation
2nd Step) (known concentration/volume of known substance)*1000 = amount of moles in the substance
3rd Step) (amount of moles in substace/volume of unknown substance)*1000 = concentration of unknown substance
EXAMPLE
0.1mol/dm3 26.3cm3 of HCl added to ?mol/dm3 25cm3 of NaOH
1st step) HCl + NaOH -> NaCl + H2O
2nd) (0.1/26.3)*1000=0.00263 moles
3rd) (0.00263/25)*1000= 0.1052
Therefore the answer is 1052mol/dm3 of NaOH
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