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Which of the following ions will contribute most to elevating the boiling point of H₂O? A) Na+ B)K+ C) Ca₂+ D) All will contribute equally O F G H J

User Knellr
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1 Answer

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Final answer:

The
Ca^{2+ ion will elevate the boiling point of
H_2O the most because it dissociates to give three ions per formula unit, leading to a higher elevation compared to Na+ and K+ which only produce two ions per formula unit.

Step-by-step explanation:

The ion that will contribute most to elevating the boiling point of H₂O among Na+, K+, and
Ca^{2+ is
Ca^{2+. This is because the boiling point elevation of a solution is proportional to the molal concentration of the dissolved particles (ions in this case), a concept known as the colligative properties of solutions.

Since each mole of CaCl₂ dissociates into three ions (one
Ca^{2+ and two Cl−), it will contribute more to the elevation of the boiling point compared to NaCl and KCl, which dissociate into two ions each.

User Eradicatore
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