A student didn't notice that her pipette tip was broken. She used the pipette properly but it consistently delivered 4.70 cm³ of

Question

2 years ago

9

vinegar instead of the desired 5.00 cm³. How would the percent by mass results obtained have been affected? Explain your answer.

1 answer:

larisa86 [58] · Answer 1 · 2023-07-03T03:07:56+03:00

The mass % will be affected by 0.25%.

<h3>What is mass percentage ?</h3>

Mass Percentage is defined as the grams of solute per gram of solution , multiplied by 100%

It is given that

She used the pipette properly but it consistently delivered 4.70 cm³ of vinegar instead of the desired 5.00 cm³.

Mass Percentage affected = ?

Mass is directly proportional to the volume

For calculating ratios of the same compound the density can be neglected

the density of vinegar is 1.05 gm/cm³

mass for 5cm³= 5*1.05 = 5.25gm

mass for 4.75 cm³ = 4.9875 gm

for 100 gm solution

mass% expected = 5.25* 100/100 = 5.25%

mass % (actual) = 4.9875 / (100-0.2625) = 5%

Therefore the mass % will be affected by 0.25%.

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