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May 6, 2019 · Updated on May 06, 2019. pH is a measure of hydrogen ion concentration , a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14. Aqueous solutions at 25°C with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline.
About. Transcript. The pH scale is used to determine the acidity or basicity (alkalinity) of a substance. Acidic substances have pH values below 7, while basic substances have pH values above 7; neutral substances have a pH of 7. The pH scale is logarithmic, so each step represents a 10-fold change in concentration. Created by Sal Khan. Questions.
Google Classroom. Definitions of pH, pOH, and the pH scale. Calculating the pH of a strong acid or base solution. The relationship between acid strength and the pH of a solution. Key points. We can convert between [ H +] and pH. using the following equations: pH = − log. [ H +] [ H +] = 10 − pH. We can convert between [ OH −] and pOH.
: a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effectiv...
Oct 22, 2019 · pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. The pH of water is a very important measurement concerning water quality.
noun. /ˌpiː ˈeɪtʃ/ [singular] (chemistry) a measurement of the level of acid or alkali in a solution or substance. In the pH range of 0 to 14 a reading of below 7 shows an acid and of above 7 shows an alkali. a pH of 7.5. to test the pH level of the soil. Wordfinder. Topics Physics and chemistry c2. Word Origin. Want to learn more?
pH is a scale of acidity from 0 to 14. It tells how acidic or alkaline a substance is. More acidic solutions have lower pH. More alkaline solutions have higher pH. Substances that aren't acidic or alkaline (that is, neutral solutions) usually have a pH of 7. Acids have a pH that is less than 7. Alkalis have a pH that is greater than 7.
