Solutions Learning Goal: To understand the concepts of solublity and dissociatio

Question

Solutions Learning Goal: To understand the concepts of solublity and dissociation. For an ionic solid to dissolve into a liquid, the ions must dissociate and become surrounded by solvent molecules. This is called solvation. When water is the solvent, it is called hydration. An example of a water-soluble ionic solid is table salt, NaCI. Salt-water can be written as NaCl(ag) indicating "aqueous.-see the figure. In contrast, an example of a water-insoluble ionic substance is zinc sulfide. Zinc sulfide does not dissociate in water, and therefore the ions cannot become hydrated. its formula is written ZnS(s) where the s stands for "solid. See the figure How can one tell whether an ionic compound is soluble? Chemistry texts usually contain a chart or list of guidelines for determining the solubility of almost any ionic compound. lonic compounds are not the only substances that can dissolve in liquids. Molecular compounds can also dissolve if the individual molecules can become solvated NaCl(eg) Soluble Based on this information, you can now understand the concept of electrolytes. An electrolye is any compound that can form ions when dissolved in water and therefore conduct electricity. Acids, bases, and soluble saits tt this categoy. NaCl is an electrolyte because it is a soluble salt and therefore dissociates. ZnS is not an electrolyte, because it is an insoluble salt and therefore does not dissociate. Sugar, even though it is soluble, is not an electrolyte because it does not dissociate into ions ZnS(s) Insoluble Part A Substance X is a molecular compound and is not an acid nor a base. Based just on this information, what can you determine about substance X? Check all that apply You did not open hints for this part ANSWER: X is soluble in water X is insoluble in water X is an electrolyte. X is not an electrolyte. Part B

Explanation / Answer

part A )

answer : X is not an electrolyte

part B)

[K+] = 2 x 0.025 = 0.05 M

part C)

answer : 0.075 M Na3PO4

explaantion:

total ion concentration = 3 x 0.075 = 0.3 M

in K2SO4 = 3 x 0.1 = 0.3 M

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