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Chapter 15: Problem 3

(a) Draw a beaker containing water and show what ions, if any, are present when ammonium bromide, \(\mathrm{NH}_{4} \mathrm{Br}\), dissolves. (b) Does the \(\mathrm{NH}_{4} \mathrm{Br}\) dissociate? What does the fact that it does or does not dissociate tell you regarding electrolyte/nonelectrolyte classification for this compound? (c) Add to your drawing from part (a) a light bulb attached to positive and negative wires. Indicate which way the dissolved species move.

Short Answer

Expert verified
When ammonium bromide (\(\mathrm{NH}_{4} \mathrm{Br}\)) dissolves in water, it dissociates into ammonium ions (\(\mathrm{NH}_{4}^{+}\)) and bromide ions (\(\mathrm{Br}^{-}\)). This indicates that it is an electrolyte, meaning it conducts electricity when dissolved in water due to the presence of mobile ions. When a light bulb is attached to positive and negative wires, the ammonium ions (\(\mathrm{NH}_{4}^{+}\)) move towards the negative wire, and the bromide ions (\(\mathrm{Br}^{-}\)) move towards the positive wire.

Step by step solution

01

(Step 1) Draw a beaker with water and ammonium bromide dissolved

To draw a beaker containing water and ammonium bromide dissolved in it, first, you need to draw a simple beaker shape. Inside the beaker, draw water as a horizontal line. Then, draw ammonium bromide molecules (\(\mathrm{NH}_{4} \mathrm{Br}\)) as solid circles scattered randomly throughout the water.
02

(Step 2) Determine if ammonium bromide dissociates

When ammonium bromide dissolves in water, it forms ammonium ions (\(\mathrm{NH}_{4}^{+}\)) and bromide ions (\(\mathrm{Br}^{-}\)) via the dissociation reaction: \[ \mathrm{NH}_{4}\mathrm{Br} \rightarrow \mathrm{NH}_{4}^{+} + \mathrm{Br}^{-} \] The fact that ammonium bromide dissociates into ions indicates that it is an electrolyte, as it conducts electricity when dissolved in water due to the presence of mobile ions.
03

(Step 3) Draw light bulb attached to positive and negative wires

Add a light bulb to your drawing by sketching a simple light bulb with two wires extending from its base down into the beaker. One wire has a positive charge (+) while the other wire has a negative charge (-).
04

(Step 4) Indicate the direction of movement of dissolved species

In the beaker, the dissolved species (ammonium and bromide ions) will be attracted to the oppositely charged wire. Therefore, the ammonium ions (\(\mathrm{NH}_{4}^{+}\)) will move towards the negative wire, and the bromide ions (\(\mathrm{Br}^{-}\)) will move towards the positive wire. You can indicate these movements in your drawing by drawing small arrowheads next to the ions pointing in the direction of the respective wires (ammonium ions pointing towards the negative wire and bromide ions pointing towards the positive wire).

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