Dear Spesande Nomlala

The molar mass of salicylic acid (SA) is 138.121 g/mol. If you add 1.38121 g or 1381.21 mg SA to 10 liters water and mix it, then you can get 10 liters of 1mM SA.

Best wishes

Kazem Ghassemi-Golezani

Exactly, 138.121 g or ml SA  in one lit is equal to 1 molar. For 1 mM one has to add 138.121 mg to 1 lit water. In this SA strength is assumed as 100 %. if it is less than 100 % need to modify accordingly.

Yes it is correct

Thank you all for the assistance, much appreciated .I also read up that SA does not dissolve in water, how do I dissolve it and add it to make my solution?

Dear Spesande Nomlala

You can use small amount of ethanol to dissolve SA and then add it to water.

Dear my colleague

exactly, SA did not dissolve in water. also it can easly dissolve in ethanole, but when you complete the volume with water it will be aggregate on the top of solution. so m you can dissolve your quantity as observed above in small quantity of methanol then complete it with water. also you can used a solvent DMSO as a good solvent for SA.

Saad

Egypt

Please take into account the change in pH of the water after dissolving SA, if you want to see exactly the effect of SA, try to use a buffer instead of water in order to adjust the pH.

also you can used any salt of salicylic like soldium salicylate or methyl salicylate which dissolved in water

There are many companies

http://www.shreesadguruenterprise.com/salicylic-acid-1602064.html

Dissolve 138 mg of salicylic acid in 10 liter water

Thanks to all for sharing your experience and inputs.

138.12 mg salicylic acid dissolved in 1 Liter water will give you 1 mM solution of SA.

For water solubility issues you can refer:

1.24 g/L (0 °C) 2.48 g/L (25 °C) 4.14 g/L (40 °C) 17.41 g/L (75 °C) 77.79 g/L (100 °C)

Thus in your case solubility is no problem.

138.12 mg salicylic acid dissolved in 1 Liter or 10 litre? Could you please elaborate...

Dear Nadia, Thanks for the correction. It is indeed 1 Liter. I have edited my answer now.

the molecular weight of a compound in grams dissolved in water and than the volume raised to 1L is called 1 Molar solution.

Calculate the molecular weight of SA (usually written on the bottle) and take 1mg. it will be 1mM in 1L of water.

now calculate it for 10L water.

1 *10= 10.

so take 10mg of SA in 10L.

Dissolved 14 g salysalic acid in 1 liter of water= 1 millimole of SA