Q 2622067831.     In the acid base titration `[H_3PO_4 (0.1 M) + NaOH (0.1 M)]` e.m.f of the solution is measured by coupling this electrodes with suitable reference electrode. When alkali is added pH of solution is in accordance with equation, `E_(cell) = E_(cell)^o + 0.059 pH`.

For `H_3PO,. Ka_1 = 10^-3 ; Ka_2 = 10^-8; Ka_3 = 10^-13`

What is the cell e.m.f. at the II nd end point of the titration if `E_(cell)^o` at this stage is `1.3805 V`.

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