Video: Identifying the Observations in Response to the Mixing of NaCl and NaMnO₄ in Water in a Set of Observations

Consider the following substances: NaMnO₄, a soluble purple solid, AgMnO₄, an insoluble purple solid, NaCl, a soluble white solid, AgCl, an insoluble white solid. Which of the following would be observed when 1.0 mol of NaCl and 0.5 mol of NaMnO₄ are mixed in 1 L of water? [A] Purple solid and colorless solution [B] Purple solid and purple solution [C] White solid and colorless solution [D] No solid and purple solution [E] No solid and colorless solution

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Video Transcript

Consider the following substances: NaMnO₄, a soluble purple solid; AgMnO₄, an insoluble purple solid; NaCl, a soluble white solid; AgCl, an insoluble white solid. Which of the following would be observed when 1.0 moles of NaCl and 0.5 moles of NaMnO₄ are mixed in one liter of water? A) Purple solid and colorless solution. B) Purple solid and purple solution. C) White solid and colorless solution. D) No solid and purple solution. Or E) No solid and colorless solution.

In this question, we’ve been given a few details about some chemicals. And we’ve been asked to predict what we would observe when we mix two of them together in water. NaCl is perhaps the most well-known salt, sodium chloride or table salt. Sodium permanganate is not so common, but it is related to the very common oxidizing agent potassium permanganate. The information at the top tells us that sodium chloride is a soluble white solid and that sodium permanganate is a soluble purple solid. Since the specific solvent hasn’t been mentioned, we can assume that soluble here refers to solubility in water.

And as we can see, that’s the solvent we’ll be mixing these substances in. Here’s our one liter of water. Let’s see what happens when we add the sodium chloride. Sodium chloride is highly soluble in water. So it dissolves to form sodium plus and seal minus ions. When the sodium permanganate hits the water, it dissolves as well, releasing purple permanganate irons into the solution, turning the liquid purple. All the solid would dissolved. So what we would observe, when he makes these amounts of sodium chloride and sodium permanganate in this amount of water, would be no solid and purple solution.

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