How would you prepare the ff. solutions:

Question

1. 45g NaCl/g H2O
2. 25% w/v NaCl
Thank you in advance.

Answer 1

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.