How much NACl do i need to dissolve in grams to make 0.9%solution of 0.25l saline
what is 250x.009 grams?
Mr Pursley is 100% correct, but I would like to add to this in the following way... (that is, in case this question is dealing with practical laboratory preps of solns.)
gms NaCl for .9% Soln = (250ml solution)[(0.9g solute / 100g solution)]=2.25 gms NaCl
%Solution Needed
-Specify Volume and Concentration needed. For % by weight solutions, transfer the needed (calculated) quantity of solute in to a calibrated mixing vessel for improved accuracy. Once solute is dissolved, transfer to final mixing container and add the final amount of solvent water up to but not to exceed. Adding too much will leave the preparation too dilute. Doc Rebel
Transfer a portion of the solvent into mixing vessel,but at a volume less than total volume needed. Follow with additional solvent, up to but not to exceed the desired total volume of solution
For needed mass of solute for any N% Soln in water (organic solvents can be a bit more tricky, ver) =>
gms Solute needed = [Volume Solution Needed(ml)] x [(N% needed)/100]
Caution: When preparing a solution, dissolve needed portion in a quantity of solvent less than the total solution volume, then add the remaining solvent up to but not to exceed the total SOLUTION volume needed. Example, a solution preparation that needs Xgms in (say) 250-ml solution does not mean dissolve Xgms solute into 250-ml of solvent. Remember, the solute takes up space. The proper way is to dissolve the needed mass into a quantity of solute less that the total volume of solution needed. Then transfer this into a calibrated mixing vessel and add the remaining solvent up to but not to exceed the total SOLUTION VOLUME needed. Adding Xgms solute into 250-ml solvent will make the solution too dilute.
To determine the amount of NaCl (sodium chloride) you need to dissolve in grams to make a 0.9% solution of 0.25 liters (250 mL) saline, you can follow these steps:
Step 1: Understand the definition of a solution expressed as a percentage.
A 0.9% solution means there are 0.9 grams of NaCl in 100 mL of solution.
Step 2: Convert the volume of the solution from liters to milliliters.
You mentioned that you want to make a 0.25 liter (250 mL) solution.
Step 3: Use the volume and the desired percentage to calculate the amount of NaCl needed.
For a 0.9% solution, you need 0.9 grams of NaCl in every 100 mL of the solution. Since you have 250 mL, you need to calculate how much NaCl is required for that volume.
(0.9 grams/100 mL) x 250 mL = 2.25 grams
Therefore, you would need to dissolve 2.25 grams of NaCl in 0.25 liters (250 mL) of saline to make a 0.9% solution.
Please note that if you are using a different concentration or a different unit of measure, the calculations may vary slightly. Always double-check the specific details and units before preparing any solution.