10,000,000 pH=0 Battery Acid Concentrated Hydrofluoric Acid 1,000,000 pH=1 Hydrochloric acid secreted by stomach lining 100,000 pH=2 Lemon juice Gastric acid Vinegar 10,000 pH=3 Grapefruit Orange juice Soda 1,000 pH=4 Acid rain Tomato juice 100 pH=5 Soft drinking water Black coffee 10 pH=6 Urine Saliva 1 pH=7 Pure water 1/10 pH=8 Sea water 1/100 pH=9 Baking soda 1/1,000 pH=10 Great Salt Lake Milk of magnesia 1/10,000 pH=11 Ammonia solution 1/100,000 pH=12 Soapy water 1/1,000,000 pH=13 Bleaches Oven cleaner 1/10,000,000 pH=14 Liquid drain cleaner Many common household substances may be classified as acids or bases. According to the pH scale, A) baking soda is a weak base while bleach is a strong base. B) coffee is a weak acid while drain cleaner is a strong acid. C) oven cleaner is a weak acid while battery acid is a strong acid. D) soft drinking water is a weak base while soapy water is a strong base.