Question

1 test: use the gizmo to find the ph of each of the available substances. classify each substance as acidic (ph < 7), alkaline (ph > 7), or neutral (ph = 7).
0 - 14 ph indicator paper
material in the tube | ph value | acidic, alkaline, or neutral?
baking soda
bleach
coffee
cola
drain cleaner
hand soap
juice (lemon)
juice (orange)
juice (tomato)
milk
milk of magnesia
oven cleaner
saliva (human)
shampoo
stomach acid
vinegar
water (distilled)
water (ocean)

Explanation:

Step1: Recall pH - based classification rules

Acidic: pH < 7; Alkaline: pH > 7; Neutral: pH = 7

Step2: Use common - knowledge pH values

Baking soda: pH ≈ 9, Alkaline
Bleach: pH ≈ 12, Alkaline
Coffee: pH ≈ 5, Acidic
Cola: pH ≈ 2.5, Acidic
Drain cleaner: pH ≈ 14, Alkaline
Hand soap: pH ≈ 10, Alkaline
Lemon juice: pH ≈ 2, Acidic
Orange juice: pH ≈ 3.5, Acidic
Tomato juice: pH ≈ 4.5, Acidic
Milk: pH ≈ 6.5, Slightly acidic
Milk of magnesia: pH ≈ 10.5, Alkaline
Oven cleaner: pH ≈ 13, Alkaline
Saliva: pH ≈ 6.5 - 7.5, Slightly acidic to neutral
Shampoo: pH ≈ 5.5 - 7, Slightly acidic to neutral
Stomach acid: pH ≈ 1 - 3, Acidic
Vinegar: pH ≈ 2.5 - 3, Acidic
Distilled water: pH = 7, Neutral
Ocean water: pH ≈ 8.1, Alkaline

Answer:

Material in the tube	pH value	Acidic, alkaline, or neutral?
Bleach	12	Alkaline
Coffee	5	Acidic
Cola	2.5	Acidic
Drain cleaner	14	Alkaline
Hand soap	10	Alkaline
Juice (lemon)	2	Acidic
Juice (orange)	3.5	Acidic
Juice (tomato)	4.5	Acidic
Milk	6.5	Slightly acidic
Milk of magnesia	10.5	Alkaline
Oven cleaner	13	Alkaline
Saliva (human)	6.5 - 7.5	Slightly acidic to neutral
Shampoo	5.5 - 7	Slightly acidic to neutral
Stomach acid	1 - 3	Acidic
Vinegar	2.5 - 3	Acidic
Water (distilled)	7	Neutral
Water (ocean)	8.1	Alkaline