Why edta is insoluble in water

I can't afford to make another solution because the EDTA is running out. Any help? I should add mL water to increase the volume to 1L, right? I don't get why the book says it will give 0.

Thanks in advance. Sorry to add on to this. I didnt know that it should be pellets So I thought.. Not sure how many g i added but it was way above the calculated 2g. Just add them slowly and you should be fine. I prepare only mL of mM. I put the solution on a magnetic stirrer, and add NaOH from time to time until it dissolves. If I'm hurry the pH will be to high.

I went back to the lab just a while ago to follow your suggestions of adding the NaOH slowly. It took forever but at least it is dissolving now.

I am letting it stir overnight. I know both my assumptions are wrong since adding NaOH actually helped. What might be the actual reason which is counterbalancing the above mentioned 2 effects are they even valid in this case?

By the way, higher pH is generally better especially if you plan to use it for chelation, i. A similar example would be 4- t -butylphenol, which is nearly impossible to dissolve in water without addition of a base, e. In experiments I had to reach pH of about 12 to strip the compound of the alcohol-proton, yielding a negative charge which interacts more strongly with water.

That is the reason why EDTA is not a primary analytical standard, and needs to be standardized after dissolving it. Adding NaOH also increases the ionic strength of the soln. Common ion effect doesn't play a big role, as Ksp value is quite large. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Asked 5 years, 5 months ago. Active 4 years, 8 months ago. Viewed 15k times. Improve this question. Polisetty Polisetty 1 1 gold badge 5 5 silver badges 20 20 bronze badges. If it neutralises completely shouldn't it be pH 7. Add a comment. Active Oldest Votes. Improve this answer. I'm actually doing a western blot which has a buffer of pH of 7.

Or why is the dis odium salt more feasible?