Question

2. I. M. Fumblefingers determined the mass of a 100 mL volumetric flask but did not notice that it contained about 1 mL of water. Fumblefingers then prepared an 8% sugar solution by transferring 8.00 g of sugar to the flask and filling to the mark with distilled water. I. M. then determined the mass of the flask plus the 8% sugar solution. a. Will the concentration of the solution be higher, lower, or no different from the correct value? Explain. b. Will the density Fumblefingers determines for this solution be higher, lower or no different from the correct value? Explain.

Answer 1

By definition 8% solution means we have to

weigh 8 grams of solute --> then we have to carefully transfer it into a 100 mL volumetric flask --> fill the flask up to the mark with pure distilled water (solvent)

this gives a perfect 8% solution.

Now addressing questions:

a) The concentration of the solution (solute + solvent) be no different from the correct value. Because we have weighed exactly 8 grams of sugar and transferred it into 100 mL volumetric flask then anyway we have to add water, so even 1 mL of higher amount could not affect our concentration, unless we have added extra amount of water which crosses the mark or weighed more than 8 grams of sugar.

b) Since we have followed exact protocol to prepare 8% solution, so it would not affect calculated density also, so the density fumblefingers determines for this solution will be no different from the correct value, unless we have added extra amount of water which crosses the mark or weighed more than 8 grams of sugar.

Hope this helped you!

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