Which of the following has the lowest pH?

A. concentrated sugar solution
B. gastric fluid
C. pure water
D. concentrated sodium hydroxide solution

Answer:
B. gastric fluid is an acid

pure water is neutral
concentrated sugar solution & concentrated sodium hydroxide solution are alkaline
A liquid may be an acid, base, or neutral. The degree of acidity or basicity can be measured by using the pH scale. The scale is divided into three areas: Acid (readings below 7), neutral (reading of 7), and basic (readings above 7). Each division either increase or decreases the pH of a substance 10 times. The pH of 5 is ten times more acidic than a pH of 6. Water has a pH of 7 but when it mixes with air the suspended materials will either raise or lower its pH. Acid Rain is an example of this type of reaction.

Answer is D. concentrated sodium hydroxide solution
Gastric fluid contains HCl, and has the lowest pH.
A and C are neutral, and D has a very high pH.
B. Gastric acid (pH averages 1 to 3)

Water is neutral (pH ~7.0). Sugar should also be around 7.0 pH even if concentrated. Concentrated sodium hydroxide solution has a pH of 14 being a nearly pure base.

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