25 mL of a 0.107 M H3PO4 was titrated with a 0.115 M solution of a NaOH solution to the end point identified by the colour change of the indicator,bromocrescol green.This required 23.1mL.The titration was repeated using phenolphthalein indicator.This time 25 mL of 0.107 M H3PO4 required 46.8 mL of the 0.115 M NaOH.What is the coefficient n in the equation,
H3PO4+nOH-→nH2O+[H(3-n)PO4]n- for each reaction?
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