Answer:The concentration of the original NAOH solution is 0.242 M.
Explanation:
We know that for neutralization reaction the no. of mole of H+ ions from the acid must be equal to that of those of OH- ions released from base.
Since both HBR and NAOH are monobasic and monoacidic respectively we can use the formula
No. of milimoles of H+ = No. of milimoles of OH- ( Note – as both the volumes are given in ml so take milimoles)
Or; MV(HBR)=MV(NAOH)
24.2x0.2=20xM(NAOH)
Or; Molarity =0.242M.
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