Trial 1 (Yours) Trial 2 (Partner\'s) Volume of solution Mass of paper Mass of pa

Question

Trial 1 (Yours) Trial 2 (Partner's) Volume of solution Mass of paper Mass of paper plus copper CALCULATIONS Trial 1 (Yours) Trial 2 (Partners) Mass of copper Molarity of solution 0.12 M Average Molarity QUESTIONS For each of the following, determine whether the calculated molarity would be too low, too high, or unaffected and explain why. Be specific. 1. a. You added 1.0 g zinc (instead of 0.3-0.4 g) to your unknown. You added 50 mL DI water (instead of 25 mL) to your 10.00 mL unknown sample and then added the Zn. b.

Explanation / Answer

Molarity = moles of solute / volume of solution in liter

Since moles is obtained by dividing mass by molar mass,

Molarity = (mass / molar mass) / volume solution inliter

So, molarity is directely proportional to the mass of solute and inversely proportional to the volume of solution.

(a):

You add 1.0 g zinc instead 0.3-0.4 g; higher amount of solute.

So, the calculated molarity will be too high.

(b):

You add 50 mL instead 25 mL; higher amout of volume.

So, the calculated molarity will be too low.

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