# If the following replicate volumes of HCl were obtained during the titration of 25.0 cm3 0.05M Na2CO3 with HCl acid solution using bromocresol green indicator to reach an end point; 20.1, 20.2, 20.1, 20.3 i. Determine the mean of volume of HCl acid. [1 mk] ii. Calculate the molarity of the HCl acid. [3mks] c) HClO4 is a stronger acid than HClO

Solution-
i) mean=
(sum of all volumes of HCl / total no. Of volumes)
$\frac{807}{4}$
=20.175

ii) using the equation,
M1V1 ( HCl) = M2V2( Na2CO3)
M1 × 20.175 = 0.05 × 25
M1 = 0.061 M

iii) For oxyacids of same hydrogen and different different oxidation state, the acid strength increase with the increasing in oxidation state and no. Of oxygen atom.
HClO4 has +7 and HClO has +1 oxidation state.

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