[Yoyomel]

@em88
This is very helpful. I was thinking the same thing therefore I will probably dissolve the powdered ingredients in a small amount of water before adding to the cream base. The other option you mentioned for heating the cream base worries me a bit for fear of reducing the efficacy of any ingredients but my worries might be unwarranted. Below are the ingredients for the cream base, only. 

Lastly, I’m slightly unclear regarding your last comment: “Try to make a water base dilution with the exact concentration of those ingredients you are adding and check if those ingredients do cause pH change.”…Can you elaborate more?

Once again I would ultimately like to check ph of the final product after the powdered ingredients are added. 

Thank you again for your time!

Inactive ingredients (cream base): Water, Organic Coconut Oil, Grapeseed Oil, Emulsifying Wax, Stearic Acid, Glycerin, Xanthan Gum, Phenoxyethanol, Tetrasodium Glutamate Diacetate

[Yoyomel]

@tanelise, @Doreen , @em88 
Thank you all for the abundant replies. Perhaps I should have been more clear with my initial scenario. 

I’m currently adding my actives (anti-microbials) to an already premade lotion base. The lotion base has already been ph balanced but I would like to check PH after I add the powdered actives. Therefore the cool down phase would not apply in this situation. 

I’m still undecided on how best to do this especially after reading all the wonderful replies. Heating a sample of the final product and testing ph seems like a good option but @Doreen reminded me that ph is temp dependent. I’m trying to reach a range in between 5-6 ph. How much more acidic of a reading would warming the product produce?

And the dilution method with DI water still escapes my mind. If DI water is say 7ph and my lotion is 3ph, wouldn’t adding these two ph numbers equate to something in between hence giving me an inaccurate reading? 

[Yoyomel]

@amitvedakar Thank you for the info. Can you elaborate a little more? Are we talking about distilled water? Also wouldn’t the PH of the water effect the ph of the lotion thereby changing the ph?

[Yoyomel]

@em88 Very interesting I’ll have to try this. BTW would heating in any way diminish the efficacy of any actives specifically anti-microbials?