What is meant by pH value?

Question

How it is used?

Answer 1

pH is a measure of acidity vs alkalinity. It ranges from 0 to 14, with 7 being neutral, neither acid nor base. Pure water has a pH of 7. This makes a great deal of sense, because acids release H+ ions in aqueous solution while alkalines (or "bases") release OH- ions. Water is H2O, meaning it exactly balances these qualities of acids and bases. pH actually comes from the French "pouvoir hydrogène," which translates as "hydrogen potential." The scale is logarithmic, so an acid with a pH of 5 is ten times as strong as one with a pH of 6.

Answer 2

What Is Meant By Ph

Answer 3

PH is a measure of acidity and alkalinity. On a scale of 1-10, 7 represents neutrality, lower numbers indicate increasing acidity and higher numbers increasing alkalinity. Each unit of change represents a tenfold change in acidity or alkalinity. The pH of urine can range from an extremely unhealthy low of 4.5 to a high of 8.5. A high pH value may indicate the body is over buffering to compensate for a physiological system that is too acidic.

The hydrochloric acid in the stomach is required for digestion and high acidic levels in the body actually inhibit the proper production of stomach acids. When the body pH is too acidic the body's response is to compensate by secreting less acidic fluids and a shortage of proper stomach acid is the result.

Balance is the key. Too alkaline is as undesirable as too acidic (though easier to tolerate). In a pH balanced body, urine is slightly acid in the morning (after fasting), with a pH range of 6.5 - 7.0, generally becoming more alkaline, pH = 7.5 - 8.0, by evening as the body digests food and releases electrolytes.

Unhealthy pH- under 6.0
Normal pH- 6.5 TO 8.0
Unhealthy pH- above 8.5

Answer 4

pH value means in short hwo acidic or alkaline a chemical compound is. The higher the number the more alkaline a compound is. 7 is neutal. A more in depth answer is... : an indicator of the acidity or alkalinity of a substance of solution, represented on a scale of 0-14, 0-6.9 being acidic, 7 being neither acidic or basic (i.e., neutral), and 7.1-14 being basic. These values are based on hydrogen ion content and activity.

Answer 5

pH is a measure of the acidity of a solution in terms of activity of hydrogen ions (H+). For dilute solutions, however, it is convenient to substitute the activity of the hydrogen ions with the molarity (mol/L) of the hydrogen ions (however, this is not necessarily accurate at higher concentrations [1] [2]).

In aqueous systems, the hydrogen ion activity is dictated by the dissociation constant of water (Kw = 1.011 × 10−14 M2 at 25 °C) and interactions with other ions in solution. Due to this dissociation constant, a neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered basic.

The concept was introduced by S.P.L. Sørensen in 1909, and is purported to mean "pondus hydrogenii" in Latin.[3] However, most other sources attribute the name to the French term pouvoir hydrogène. [4] [5] [6] In English, pH can stand for "hydrogen power,"[4] [5] [6] "power of hydrogen," [7] [8] or "potential of hydrogen."[3] [9] [10] All of these terms are technically correct.

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Answer 6

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RE:
What is meant by pH value?
How it is used?

Answer 7

pH is the p function of the hydronium ion concentration in a solution. it is the measure of the basicity and the alkalinity of a substance. straong acid's pH ranges from 1-2 and weak acids, 3-6... 7 is neutral, 8-12 weak bases and 13-14 strong bases.

Answer 8

A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14.

p(otential of) h(ydrogen)

Answer 9

pH is a measure of the acidity of a solution in terms of activity of hydrogen ions (H+). For dilute solutions, however, it is convenient to substitute the activity of the hydrogen ions with the molarity (mol/L) of the hydrogen ions (however, this is not necessarily accurate at higher concentrations.

In aqueous systems, the hydrogen ion activity is dictated by the dissociation constant of water (Kw = 1.011 × 10−14 M2 at 25 °C) and interactions with other ions in solution. Due to this dissociation constant, a neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered basic.

pH can be measured:


by addition of a pH indicator into the studying solution. The indicator color varies depending on the pH of the solution. Using indicators, qualitative determinations can be made with universal indicators that have broad color variability over a wide pH range and quantitative determinations can be made using indicators that have strong color variability over a small pH range. Extremely precise measurements can be made over a wide pH range using indicators that have multiple equilibriums in conjunction with spectrophotometric methods to determine the relative abundance of each pH dependent component that make up the color of solution, or
by using a pH meter together with pH-selective electrodes (pH glass electrode, hydrogen electrode, quinhydrone electrode, ion sensitive field effect transistor and others).

Answer 10

pH value is important for any liquid coz it indicates if it is acidic or alkaline in nature, it starts from 0 to 14 , 7 is the neutral point. The acidic nature is due to the h+ ions and alkaline is due to OH- ions in the liquid.