[Boomer]

I take it that I should be using the 3.6 weight, and how much water should be used when mixing these.



A 3.6 % NaCl solution has 3.6 grams of sodium chloride dissolved in 100 ml of solution

Pour the water it into a graduated cylinder or volumetric flask containing about 80 ml of water. Once the sodium chloride has dissolved completely (swirl the flask gently if necessary), add water to bring the ***volume*** up to the final 100 ml. **Do not** simply measure 100ml of water and add 10g of sodium chloride. This will introduce error because adding the solid will change the final volume of the solution and throw off the final percentage.