AP BIOLOGY

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BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Reading Passage:pH is a determined value based on a defined scale, similar to temperature. This means that pH of water is not a physical parameter that can be measured as a concentration or in a quantity. Instead, it is a figure between 0 and 14 defining how acidic or basic a body of water is along a logarithmic scale. The lower the number, the more acidic the water is. The higher the number, the more basic it is. A pH of 7 is considered neutral. The logarithmic scale means that each number below 7 is 10 times more acidic than the previous number when counting down. Likewise, when counting up above 7, each number is 10 times more basic than the previous number.Question:According to the passage, Acidic solutions have a pH that is
A
less than 7.
B
between 0 and 14.
C
a negative number.
D
more than 7.
Explanation: 

Detailed explanation-1: -Detailed Description. pH is a measure of how acidic/basic water is. The range goes from 0-14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

Detailed explanation-2: -What is pH scale in chemistry? The pH is a measure of the concentration of hydrogen ions, the acidity or alkalinity of a solution. The pH-scale is normally between 0 and 14. Aqueous solutions at 25 ° C with a pH of less than 7 are acidic and basic or alkaline solutions are those with a pH greater than 7.

Detailed explanation-3: -The Procedure of Determination of pH Using pH paper: Drop of the sample on the pH paper using a clean dropper. Observe the change in the colour of the pH paper. Now compare the colour obtained on the pH paper with the colour shades on the standard pH chart. Make a note of the pH value obtained.

Detailed explanation-4: -The pH value of a solution is directly dependent on the temperature. A pH value without a temperature value is incoherent. Solution temperature compensation (STC) converts measured pH to the pH at 25°C.

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