Question

question 17 (5 points)
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when nacl is dissolved in water, it separates into na+ and cl- ions, which are also dissolved in water. how would the phase of the nacl, the na+, and the cl- be written in the reaction equation?
a) (l)
b) (s)
c) (g)
d) (aq)

Explanation:

To determine the phase notation for \( \text{NaCl} \), \( \text{Na}^+ \), and \( \text{Cl}^- \) when dissolved in water:

• \( \text{(l)} \) denotes liquid (e.g., pure water), but \( \text{NaCl} \) is a solid before dissolving, and ions are dissolved, not liquid. Eliminate A.
• \( \text{(s)} \) denotes solid. However, when \( \text{NaCl} \) dissolves, it is no longer a solid but forms dissolved ions. Eliminate B.
• \( \text{(g)} \) denotes gas. The ions are dissolved in water, not gaseous. Eliminate C.
• \( \text{(aq)} \) (aqueous) denotes a substance dissolved in water. When \( \text{NaCl} \) dissolves, it dissociates into \( \text{Na}^+(\text{aq}) \) and \( \text{Cl}^-(\text{aq}) \), and the dissolved \( \text{NaCl} \) (as ions) is also aqueous. Thus, D is correct.

Answer:

D) (aq)