Question

Which of the following has maximum pH?
(A) Black Coffee
(B) Blood
(C) Gastric Juice
(D) Saliva

Answer 1

Hint : pH is a measure used in chemistry to describe the acidity or basicity of an aqueous solution. The pH in acidic solutions is lower than that of basic or alkaline solutions. The pH scale is logarithmic, indicating the concentration of hydrogen ions in a solution in reciprocal order.

Complete Step By Step Answer:
The pH in water is a measurement of how acidic or basic it is. The scale runs from 0 to 14, with 7 being the neutral value. Acidity is shown by a pH less than 7, whereas a pH greater than 7 implies a base. pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.
pH of the following options are listed below
Black coffee →5.0
Coffee has a pH value in the range of 5, indicating that it is acidic rather than alkaline.
Blood→7.4
A pH of 7.0, which is in the centre of the scale, is considered neutral. Blood is slightly basic by nature, with a pH range of 7.35 to 7.45. The pH of blood is usually held similar to 7.40 by the body. This means the blood is mildly alkaline or basic by itself.
Gastric juice →1.8−2.0
Normal gastric juices are acidic by nature, with a pH of about 1-2. Gastric parietal cells secrete hydrochloric acid to suppress or inhibit the growth of certain microbes, as well as to aid in the denaturation of proteins as they join the gastrointestinal tract.
Saliva→6.8.
Saliva's pH ranges from 6.2 to 7.6, with 6.7 being the average. The pH of the mouth should not dip below 6.3 at rest. Saliva keeps the pH in the oral cavity close to neutral (6.7-7.3).

Note :
Every hydrogen-containing material capable of donating a proton (hydrogen ion) to another substance is classified as an acid. A base is a molecule or ion that may take a hydrogen ion from an acid and accept it.