In a 1.0 L sample of 0.1 M hydrochloric acid (HCl) the concentration of hydronium ions is 1 × 10 -1. A solution with a pH less than 7 is considered acidic; a solution with a pH greater than 7 is considered basic, or alkaline. Battery-powered portable pH meters are widely used for field tests of the pH of soils. All rights reserved. H2O2 ←—-> HO2^- + H^+ Theoretically, pH will be half of the pKa, that is, pH~6 However, in practice, because hydrogen peroxide is a strong oxidizing reagent, stabilizer is often added to its commercial product. He introduced the term pH and defined it as “pH of a solution is the negative logarithm (to the base 10) of the hydrogen ion (strictly speaking H 3 O +) concentration in mol L-1)”. The pH is a dimensionless quantity and its values indicate acidity, basicity and neutral nature of any medium. pH is a logarithmic measure of the hydrogen ion concentration of an aqueous solution pH = -log[H+] where log is the base 10 logarithm and [H+] is the hydrogen ion concentration in moles per liter. Digital readouts have the advantage of exactness, while analog readouts give better indications of rates of change. Corrections? The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion —which ordinarily ranges between about 1 and 10 −14 gram-equivalents per litre—into numbers between 0 …

Different manufacturers may use different stabilizers, which could change the pH of H2O2 solution slightly.

The paper will turn blue when a solution is alkaline. The meter may have either a digital or an analog (scale and deflected needle) readout. pH = – log 10 [H 3 O +] = log 1[H +] … … … (1) For example the pH of a Solution having a hydrogen ion concentration of 10-3 … Acidic soil can be “sweetened,” or neutralized, by treating it with lime. The most common method is a pH meter, which involves a pH-sensitive electrode (usually made of glass) and a reference electrode. This is done by taking the negative logarithm of the H+ concentration (-log (H+)). A pH meter is used to measure the acidity or basicity of liquids. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The low pH (high acidity) in the stomach helps in digestion enhances the activity of certain digestive enzymes and transport of H+ ions across the cell membrane. Typically, the hydrogen ion concentration of a solution is expressed in terms of pH. Acid content of soil is heightened by the decomposition of organic material by microbial action, by fertilizer salts that hydrolyze or nitrify, by oxidation of sulfur compounds when salt marshes are drained for use as farmland, and by other causes. These are strips of paper that have been treated with an indicator. pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L -1 pH = -log 10 [H + ] where [H +] is the concentration of hydrogen ions in mol L -1 (mol/L or M)



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