Answer:
The concentration of HClO4 is 0.17M
Explanation:
Equation of reaction:
HClO4 + NaOH = NaClO4 + H2O
CaVa/CbVb = Na/Nb
From the equation of reaction, number of moles of acid (Na) is 1 and number of moles of base (Nb) is also 1
Va (volume of acid) = 30mL, Cb (concentration of base) = 0.21M, Vb (volume of base) = 23.62mL
CaVa = CbVb (Na/Nb = 1)
Ca (concentration of acid) = CbVb/Va = 0.21×23.62/30 = 0.71M
