Question

For each entry with a range, pick any value that falls within the ranges given. Complete the remaining calculations using your entered data.

Mass of evaporating dish and watch glass (g): 50.75-50.90
Volume saturated NaCl solution (mL): 5.00 mL
Mass of evaporating dish, watch glass, and NaCl solution (g): 57.35-57.45
Mass of evaporating dish and watch glass after heating (g): 52.70-52.80

Calculate the following:
Question 1: Mass of dry evaporating dish or small beaker (without the watch glass)
Question 2: Precise volume of NaCl solution
Question 3: Mass of evaporating dish or small beaker and NaCl solution (no watch glass)
Question 4: Subtract to find the mass of NaCl solution
Question 5: Mass of evaporating dish or small beaker, and salt (dry solid)
Question 6: Subtract to find the mass of the salt (solute) that was in the salt water sample
Question 7: Calculate the m/m % of your salt water sample
Question 8: Calculate the m/v % of your salt water sample
Question 9: Calculate the moles of NaCl in your salt water sample
Question 10: Convert the ml of your salt solution to liters
Question 11: Calculate the molarity of your salt water sample solution.

Answer 1

Calculations involve using mass and volume data to establish concentration and other parameters of a NaCl solution. Key concepts like mass percent, molarity, and solution preparation are central to the answer.

Step-by-step explanation:

This question deals with the preparation and analysis of a saturated sodium chloride (NaCl) solution and involves calculating mass, volume, and concentration of the solute based on provided mass range data.

To calculate the required values, understanding of concepts such as mass percent composition, molarity, and use of conversion factors are needed. The determination of the mass of salt left after evaporation indicates the understanding of the separation of mixtures by physical means like heating. For exercising the math involved, conceptual understanding of stoichiometry and solution preparation are prerequisites.

The ability to weigh, measure volumes, and calculate concentrations is essential in preparing solutions accurately. Using proper lab techniques, such as the use of volumetric flasks, is important to obtain precise concentrations when making chemical solutions.