A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide the concentration of a solution equals the mass of what’s dissolved divided by the total volume of the solution

Question

The label on the graduated cylinder says empty weight 1.50g
She put some solid sodium hydroxide into the graduated cylinder and weighed it with the sodium hydroxide added the cylinder weighted 54.257
She added water to the graduated cylinder and dissolved the sodium hydroxide completely then she read the total volume of the solution from the markings on the graduated cylinder the total volume of the solution was 66.17mL
What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits in g.mL

Answer 1

To calculate the concentration of the sodium hydroxide solution, we can follow the formula: concentration = mass of solute / volume of solution.

First, we need to calculate the mass of the sodium hydroxide (solute) added to the graduated cylinder. We do this by subtracting the empty weight of the cylinder from the weight of the cylinder with the sodium hydroxide added:

Mass of sodium hydroxide = Weight of cylinder with sodium hydroxide - Empty weight of cylinder
Mass of sodium hydroxide = 54.257 g - 1.50 g
Mass of sodium hydroxide = 52.757 g

Next, we need to convert the total volume of the solution to milliliters:
Total volume = 66.17 mL

Now, we can calculate the concentration:
Concentration = Mass of sodium hydroxide / Total volume
Concentration = 52.757 g / 66.17 mL

The concentration of the sodium hydroxide solution to be written down in the lab notebook should be 0.797 g/mL.