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Which one of the following will have the greatest number of moles of potassium ion: 10.0 mL of .10 M potassium hydroxide, 30.0 mL of 0.15 M potassium carbonate, or 25.0 mL of 0.080 M potassium phosphate

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    moles K3PO4 = M x L = 0.080 x 0.0250L = 0.002. Since there are three K^+ in 1 molecule of K3PO4 there will be 0.002*3 = 0.006 moles K^+ in that sample. The others are done the same way.

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