I am getting confused that is it needed to add 70g ammonium sulfate in 100ml solvent or 100ml solution? Should I dissolve 70g solute in 100ml solvent or dissolve solute in less than 100ml solvent. I made solution wit 70g in 50ml of water initially but the overall volume became 100ml and the solution became supersaturated. What should be done. Guide me if I m wrong.
if you'r solvent is water you should dissolve 70g of solte in 100 ml of water , if the solvent is'nt water 100ml of solvent will be changed depending on the density of the solvent
According to solubility chart of wikipedia for ammonium sulfate in water:
temperature solubility
(°C) g/salt/100 g of water
0 70,6
10 73
20 75,4
30 78,1
40 81,2
50 84,3
60 87,4
80 94,1
100 103
so, to made a saturated solution it depends on the temperature.
for instance at 20 °C solubility (or saturated solution) will have 75,4 gf of ammonium sulfate and 100 g of water. if you add less water the salt will not dissolve completely as you saw. it will dissolve after the addition of the other part of water. sometimes is easier to heat a little bit the solution to help a fast dissolution.
@Makhlouf Mohammed Rabeh My solvent is water. Plz guide me that is this 100ml solvent or 100ml overall solution? As when I added 70g in 100ml solvent the overall volume increased to 150ml. Is the saturation Disturbed or not?
Add 5.4 more grams and you will have a saturated solution with ~154 ml (at 20°C). If you need to make exactly 100 ml, then ratio the numbers in the table above (75.4*100/154 for the salt and 100*100/154 for water).
Alternatively, just add an excess of salt and decant 100 ml of the saturated solution.
You have to dissolve 38 g ammonium sulphate in 100 g distilled water at 25 degree centegrade to prepare 70% saturated solution. Because ammonium sulphate saturated solution is 4.1 M at 25 degree centegrade. Hope this information will help.
Best Regards,
/Shahidul
It's my pleasure to know that my answer was helpful. If you need any kind of Chemical Engineering help in your research, you are well come to conract: [email protected].
Best Regards,
/Mohammad Shahidul Islam.
On predicting the pH of a pure (NH4)2SO4 aq. sol.; see: https://www.researchgate.net/post/What-is-the-difference-between-using-ammonium-sulfate-and-using-sodium-sulphate-in-protein-ppt-and-seperation
- Badges
- Science topic
- Similar topics
- Counseling Psychology
- Confusion