I'm reading a standard where under the specification for a substance it says:

Solubility in Alcohol: 1 ml in 3 ml 50% alcohol remains clear to 8 ml.

Just wanted to confirm my interpretation: I make a 50-50 Ethanol + Water solution (w/w) and then add 1 ml of test-sample to 3 ml of this solution. This should remain clear.

Then I continue adding more of the alcohol solution till total quantity is 8 ml & throughout the mixture must stay clear?

Is this right? Any comments?


Here is a supplier specification from Sigma Aldrich which has a variation of the same wording:

enter image description here

  • $\begingroup$ I'm not sure what you are doing but that doesn't sound right. Are you preparing a standard (of what) from a concentrate of the substance? What is the substance? If you can be specific I'm pretty sure we can come up with the answers you need. $\endgroup$
    – airhuff
    Jan 20, 2017 at 3:00
  • $\begingroup$ @airhuff Thanks. No, not preparing a standard. Just reading a published standard for specifications of a chemical and this is one of the tests mentioned. I am just trying to interpret the test procedure correctly. From the wording it wasn't clear to me what the procedure should be. I will post an image of the actual standard if I can. $\endgroup$ Jan 20, 2017 at 3:56
  • $\begingroup$ That would be very helpful! $\endgroup$
    – airhuff
    Jan 20, 2017 at 3:57
  • $\begingroup$ @airhuff I can't find my copy of the original standard but Sigma Aldrich is a regular supplier of the chemical and their version of the specifications also lists the same (but slight modification in quantities) test. Does this help? All I need to know is what the wording of the test means. i.e. What is to be done and how are the results to be interpreted. I have given my interpretation of the test procedure. Does that look right to you? $\endgroup$ Jan 20, 2017 at 4:03
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    $\begingroup$ What you have said seems correct. I don't know why you are doing that though, but so long as you do all is good I guess. Is this a turbidity standard, or indicator? Sigma's "Solubility (Turbidity)" looks a bit unfamiliar to me. Also, they say the solubility is 1 ml in 2 ml, so where you say w/w I think should be v/v. I'm still very curious what the chemical is. I'm not sure I've helped you much here. $\endgroup$
    – airhuff
    Jan 20, 2017 at 4:35


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