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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.

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.

Grade:Upto college level

1 Answers

atharva b.
8 Points
14 years ago

the coefficient n is nothing but valence factor for the reaction.

since at end pt gm equivts are equal so

    25*0.107*n=0.115*23.1

this gives n=0.99=1. similarly for other reaction.

note that the valence factor totally depends on the reaction and can be different for a substance in 2 reactions

 

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