25ml of a 0.107M H3PO4 was titrated with a 0.115M solution of a NaOH solution to the end point identified by the colour change of the indicator, Bromocresol green. This required 23.1ml. The titration was repeated using phenolphthalein indicator. This time 25ml of 0.107M H3PO4 {Phosphoric acid} required 46.8ml of the 0.115M NaOH. What is the coefficient n in the equation, H3PO4 + nOH- = nH2O + [H(3-N) PO4] for each reaction? Ans (1;2) Sir, it is the question of Modern Approach To chemical calculations by Ramendra c. Mukerjee, page no.154, Q.no.34.

pikachu singh , 15 Years ago

Grade Upto college level