Chemistry: Calculate the molarity of a solution of glycerol made by dissolving 42.000 mLmL glycerol at 15 ∘C∘C in enough water to make 340.00 mLmL of solution.

Calculate the molarity of a solution of glycerol

agarza0326

18.01.2022

The molarity of a solution of glycerol is 1.6902 M.

Explanation:

Volume of glycerol = 42.000 mL

Mass of glycerol = m

Density of glycerol = d = 1.26 g/mL

$m=d\times V = 1.26 g/mL\times 42.000 mL=52.9200 g$

$Molarity=\frac{\text{Moles of compound}}{\text{Volume of solution (L)}}$

Moles of glycerol = $\frac{52.9200 g}{92.09 g/mol}=0.57466 mol$

Volume of the solution = 340.00 mL = $340.00\times 0.001 L$

( 1 mL=0.001 L)

$M=\frac{0.57466 mol}{340.00\times 0.001 L}=1.6902 M$

The molarity of a solution of glycerol is 1.6902 M.

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DerekMoncoal

07.03.2021

The correct answer is transfer pipette that had markings every 0.1 mL

Explanation:

Flask, beaker , pipette and graduated cylinder are the apparatus that are used in the lab to measure the volume of a chemical.

For an experiment, the measurement of chemical used must be precise and for that purpose, pipette is used.

All the other apparatus does not give precise measurements and hence cannot be used for measuring a chemical that has to be used in an experiment.

Hence, the correct answer is transfer pipette that had markings every 0.1 mL

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