diff --git a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md
index 0f83fc1..d19c7b3 100644
--- a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry Part 2.md	
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@@ -29,6 +29,17 @@
  - Reacts with fats and oils to form soap
  - Bitter-tasting
 
+## pH
+ - Used as a scale to measure how acidic or basic a substance is
+ - Presented as a scale from 0-14
+ - The lower the pH the more acidic, the higher the pH the more basic
+ - Measures `concentration` of hydrogen ions in solution
+ - pH scale is logarithmic
+ - Concentration is increased tenfold when pH is increased by 1
+    - pH 1 = 0.1 mol/L
+    - pH 14 = 0.00000000000001 mol/L
+ - Water at 25 degrees Celsius is pH 7.0 (neither acidic nor basic)
+
 ## Chemical Change
 - Similar to chemical reaction