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In the laboratory you dissolve 15.6 g of potassium nitrate in a volumetric flask and add...



In the laboratory you dissolve 15.6 g of potassium nitrate in a volumetric flask and add water to a total volume of 250 mL.

What is the molarity of the solution?  M.

What is the concentration of the potassium cation?  M.

What is the concentration of the nitrate anion?  M.

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Answer #1

molarity = weight of solute*1000/Gram molar mass *volume of solution in ml

             = 15.6*1000/101*250 = 15600/25250 = 0.6178M

KNO3 ------> K+ +        NO3-

0.6178M     0.6178M          0.6178M

concentraction of potassium cation   = 0.6178M

concentraction of nitrate anion       = 0.6178M

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