Acids: Lemon Juice (pH 2), Vinegar (pH 3), Irn Bru (pH 3.5), Conditioner (pH 3-7), Alkalis: Soap (pH 9-10), Baking Soda (pH 8.5), Shampoo (pH 7-9), Toothpaste (pH 7-10), Neutral: Pure Water (pH 7), Sugar water (pH 7), Salt water (pH 7),

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