as question. can someone help Watch

WWEKANE
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I am unsure whether the answer is d or A I know it's either one of them and not c or b.

I'm leaning more towards A as the reactants are in aqueous state so already have water. so surley when they react isnt there water from the dissolved reactants plus the 3 moles of water so the overall solution will contain more then 0.0150?



if my assumption is correct. is the additional water from reactants or aqueous sodium phosphate?
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MrMoment
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I believe its A.

End point is where number of moles of acid = base.

There are 0.005 mol of H3PO4 and 25cm^3 NaOH gives 0.015mol NaOH. Which is 3(H3PO4) and where number of moles of H+ = OH-.
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WWEKANE
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but why is D wrong as using the molar ratio 0.0150 mol of water is produced
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