How would you prepare the ff. solutions:
1. 45g NaCl/g H2O
2. 25% w/v NaCl
Thank you in advance.
What's an ff solution?
25% w/v NaCl. How much do you want? Let's say you want 100 mL.
Dissolve 15 g NaCl in some water and make to a final volume of 100 mL.
To prepare the given solutions, we need to understand the basic concepts of percent concentration and mass/volume (w/v) concentration. I'll explain how to prepare each solution step by step:
1. 45g NaCl/g H2O:
This solution is prepared by dissolving 45 grams of NaCl in a sufficient amount of water to make a final volume of 1 gram (g). Here's how you can do it:
- Measure 45 grams of NaCl using a balance.
- Take a container, preferably a beaker, and add the measured NaCl to it.
- Add a small amount of water to the beaker and stir the mixture with a stirring rod until all the solid NaCl is dissolved.
- Transfer the solution to a volumetric flask, and then add water gradually while stirring until you reach a total volume of 1 gram.
- Make sure to mix the solution thoroughly to ensure uniform concentration.
2. 25% w/v NaCl:
This solution is prepared by dissolving 25 grams of NaCl in a sufficient amount of water to make a final volume of 100 milliliters (mL). Here's how you can do it:
- Measure 25 grams of NaCl using a balance.
- Take a container, preferably a beaker, and add the measured NaCl to it.
- Add a small amount of water to the beaker and stir the mixture with a stirring rod until all the solid NaCl is dissolved.
- Transfer the solution to a volumetric flask, and then add water gradually while stirring until you reach a total volume of 100 mL.
- Make sure to mix the solution thoroughly to ensure uniform concentration.
Remember to always follow proper lab safety protocols when handling chemicals and equipment. Also, be careful with the measurements to ensure accurate concentrations.