Chemical Measurements Worksheet

Chemical Measurements

Read each question carefully and provide accurate answers. Show all your work for calculations.

1. Which of the following is the most appropriate glassware for precisely measuring 25.00 mL of a solution?

2. How many significant figures are in the measurement 0.00340 g?

3. The molarity of a solution is defined as the number of moles of solute per   of solution.

4. When diluting a concentrated acid, always add the   to the   slowly.

5. Calculate the molar mass of sulfuric acid (H₂SO₄). (Atomic masses: H=1.01 g/mol, S=32.07 g/mol, O=16.00 g/mol)

6. Describe the process of preparing a standard solution of sodium carbonate from a primary standard.

7. A percentage error calculation indicates the accuracy of a measurement.

8. Precision refers to how close a measured value is to the true value.

9. A student needs to prepare 500.0 mL of a 0.250 M solution of NaCl. What mass of NaCl (molar mass = 58.44 g/mol) is required?

10. In a titration, 25.00 mL of an unknown concentration of HCl is neutralized by 35.20 mL of 0.150 M NaOH. Calculate the concentration of the HCl solution.