Question

Sebanyak 20 gram Kristal NaOH ( Mr = 40 ) dilarutkan dalam 100 gram air, jika NaOH mengion sempurna, hitunglah fraksi mol total ion-ion ( fraksi mol Na+ ditambah fraksi mol OH- dalam larutan ). (Ar H = 1 ; Na = 23 ; O = 16)

bantu ya :)

Answer 1

NNaOH = 20/40 = 1/2 = 0.5 mol
nH₂O    = 100/18 = 5.56 mol
    -> nNa⁺ = 23/80 = 0.29 mol

    -> nOH⁻ = 17/80 = 0.21mol

  -> nOH⁻ = 5.24 mol

= 0.29/0.5 = 0.58

= \frac{0.21+5.24}{5.56+0.5} [/tex] = 5.45/6.06 = 0.899