in other words what kind of salts increase the osmotic pressure with the same salt content.
for example 1g of NaCl or 1 gr of Na2SO4 or KCl or ....
Assuming the applicability of the van 't Hoff law for the osmotic pressure, according to which the osmotic pressure is linearly proportional of the moles of the solute in the solution, for a given mass of the solute (e.g. 1g as indicated in the question) the osmotic pressure is highest for the solute with the lowest molar mass. Since for the molar masses of NaCl, Na2SO4 and KCl one respectively has 58.44277 g/mol, 142.04214 g/mol, and 74.5513 g/mol [1], the highest osmotic pressure is achieved by using NaCl.
[1] I have taken the data from the following pages:
https://www.convertunits.com/molarmass/NaCl
https://www.convertunits.com/molarmass/Na2SO4
https://www.convertunits.com/molarmass/KCl
It was a great answer from you dear professor. Infact, I am going to increase the osmotic pressure of a solution without changing the salt content. I have obtained good results by adding some KCl into NaCl solution. According to colligative property which an impurity can lead to an increase in osmotic pressure. In fact I am working with Red Blood Cell (RBC) which is very sensible to the osmotic pressure and the solution should be isotonic, which is extremely important
Seyyed Jafar Saghanezhad : Thank you. Incidentally, you could straightforwardly extend the van 't Hoff law for a mixture of solutes. Naturally, if you are doing experiments, you could subsequently experimentally test your theoretical results.
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