Obtaining an accurate and consistent pH measurement in concentrated salt solutions such as OxyChem calcium chloride products can be challenging. The results can vary significantly depending on the type of pH probe used and to what degree (if any) the solution is diluted before measurement. That being said, OxyChem calcium chloride products are somewhat alkaline, thanks to the presence of a small amount of calcium hydroxide impurity. If you take an undiluted sample of 35% solution, the pH reading should be around 9.