Describe the process you would use in order to prepare 5.00 kg of an aqueous solution that is 8.00% in NaCl By mass.
To prepare 5.00 kg of an aqueous solution that is 8.00% in NaCl by mass, the following process can be used:
1. Calculate the amount of NaCl needed:
- 8.00% of 5.00 kg = 0.08 x 5.00 kg = 0.40 kg
- Therefore, 0.40 kg of NaCl is needed to prepare the desired solution.
2. Dissolve the NaCl in water:
- Add some water to a suitable container.
- Slowly add the NaCl to the water while stirring continuously to ensure it dissolves completely.
- Continue adding water until the final volume of the solution is 5.00 kg.
3. Verify the concentration of the solution:
- Measure the mass of the solution using a scale.
- Calculate the percentage of NaCl in the solution by mass:
- Mass of NaCl in the solution / Mass of the solution x 100%
- (0.40 kg / 5.00 kg) x 100% = 8.00%
- The final concentration of the solution should be 8.00% by mass.
4. Store the solution:
- Pour the solution into a clean, labelled container.
- Store the solution in a cool, dry place away from sunlight and heat sources.
- Avoid storing the solution in a metal container as NaCl can corrode metals.
To prepare 5.00 kg of an aqueous solution that is 8.00% in NaCl by mass, you would follow these steps:
Step 1: Calculate the mass of NaCl needed:
To determine the mass of NaCl needed, you can use the formula:
mass = (percentage / 100) * total mass
In this case, the desired percentage is 8.00% and the total mass is 5.00 kg.
mass of NaCl = (8.00 / 100) * 5.00 kg
Step 2: Calculate the mass of water needed:
To find the mass of water needed, subtract the mass of NaCl from the total mass:
mass of water = total mass - mass of NaCl
Step 3: Convert the mass of NaCl to grams:
Since the percentage is given as a mass percentage, convert the mass of NaCl to grams by multiplying it by 1000 to convert from kg to grams.
mass of NaCl (in grams) = mass of NaCl (in kg) * 1000
Step 4: Convert the mass of water to liters:
Since the mass of water is in kilograms, convert it to liters by dividing by the density of water, which is approximately 1 g/ml or 1000 kg/m^3.
mass of water (in liters) = mass of water (in kg) / density of water
Step 5: Combine the NaCl and water:
Measure out the calculated mass of NaCl and dissolve it in the measured mass of water to prepare the desired solution.
Please note that it is important to accurately measure the mass of NaCl and water to ensure the desired concentration of the solution. Additionally, safety precautions should be followed when handling chemicals.