Three students studied the following solubility curve. They were asked to determine the
amount of NHC that needs to be added to
589 MH CI to create a saturated solution at
80°C
120
Student 1 said 25 g more would need
to be added, student 2 said 22 g and
student 3 said 17g NH CI needs to be
added,
Solubility (g/100g 1,0
Which student is correct? Provide
evidence from the solubility curve to
support your claim.
20

That is a lot of moles that you have

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Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.