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25.0 ml of an lioh solution were titrated with 29.15 ml of a 0.205 m h3po4 solution to reach the equivalence point. what is the molarity of the lioh solution? h3po4 3lioh - ligpo4 3h20 [ ? ]m



Answer :

The molarity of LiOH solution is 0.7171 M

For given question,

25.0 ml of an LiOH solution were titrated with 29.15 ml of a 0.205 m H3PO4 solution to reach the equivalence point.

We nee to find the molarity of the LiOH solution.

First we write the equation for reaction.

H3PO4 + 3LiOH -> Li3PO4 + 3H2O

Now we find the moles of H3PO4 used.

moles = molarity x volume

          = 0.205 x 29.15

          = 5.976 moles

By use of mole ratio between H3PO4 : LiOH  which is 1:3

So, the moles of LiOH would be,

3 × 5.976 = 17.928 moles

Now we find the molarity of LiOH

Molarity of LiOH = moles /volume

Here volume = 25 ml

Molarity of LiOH = 17.928 /25

Molarity of LiOH = 0.7171 M

Therefore, the molarity of LiOH solution is 0.7171 M

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