I need help for a Chemistry HW which I do not understand

[Hisham Munawar]

Could someone explain to me how do I do this question?

 

[ptet.chemistry]

This is a typical problem from Jim Clark's excellent book on calculations. Check out how I have covered similar Kc calculations in my topical playlist on chemical equilibria. Do link to the idea of solution chemistry of backward titration covered in mole calculations and stoichiometry playlist as well.

1. You take out a small amount for your titration. Work out the mole of carb acid remaining at equilibrium from the backward titration

2. Don't forget the actual titration involves only 25 cm3 of sample, so your 250 cm3 from the equilibrium mixture (still containing acid) will have 10 times as much mole!

3. The rest are simple, direct, usual Kc type of calculations.

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A Level - AS - Chemical equilibria (qualitative Le Chatelier, quantitative Kc and Kp calculations)

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[Hisham Munawar]

Thank you very much