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debadutta mishra Grade: 11
        How much water should be added to 10g of acetic acid to give a hydrogen ion concentration of 10^-3 M(given:pKa=4.74)?
6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

let mass of water added is V litre...


molarity = 10/60V =1/6V                            (molar mass of acetic acid is 60)


[H+] = (KaM)1/2


M = [H+]2 /Ka .............1


H+ = 10-3  &        pka = -logKa = 4.74


                         Ka = 1.8*10-5


now M = 10-6 / 1.8*10-5 =1/6V


      V = 3 L

6 years ago
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