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
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
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.
To find the concentration of the sodium hydroxide solution, we need to calculate the mass of sodium hydroxide dissolved and divide it by the total volume of the solution.
First, we calculate the mass of sodium hydroxide dissolved:
Mass of sodium hydroxide = Weight of graduated cylinder with sodium hydroxide - Weight of empty graduated cylinder
Mass of sodium hydroxide = 54.257g - 1.50g = 52.757g
Next, we calculate the concentration of the solution:
Concentration = Mass of sodium hydroxide / Total volume of the solution
Concentration = 52.757g / 66.17mL
To ensure the correct number of significant digits, we use the least number of significant digits given in the question, which is 3 significant digits. Therefore, the concentration should be written as:
Concentration = 0.797 g/mL (rounded to 3 significant digits)