The letter p could stand for the French puissance, German Potenz, or Danish potens, meaning "power", or it could mean "potential". Sørensen describes a way of measuring pH using potential differences, and it represents the negative power of 10 in the concentration of hydrogen ions.
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The exact meaning of the letter p in "pH" is disputed, as Sørensen did not explain why he used it. ) of a solution, the negative value of the Briggsian logarithm of the related hydrogen ion normality factor is to be understood.įor the sign p, I propose the name 'hydrogen ion exponent' and the symbol p H as a subscript to the lowercase p, thus: p H.The concept of pH was first introduced by the Danish chemist Søren Peder Lauritz Sørensen at the Carlsberg Laboratory in 1909 and was revised to the modern pH in 1924 to accommodate definitions and measurements in terms of electrochemical cells. Measurements of pH are important in chemistry, agronomy, medicine, water treatment, and many other applications. The pH of aqueous solutions can be measured with a glass electrode and a pH meter, or a color-changing indicator. Primary pH standard values are determined using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases. The neutral value of the pH depends on the temperature – being lower than 7 if the temperature increases. Solutions with a pH of 7 at this temperature are neutral (e.g. Īt 25 ☌, solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic. More precisely, pH is the negative of the base 10 logarithm of the activity of the H + ion. the decimal cologarithm) of the molar concentration of hydrogen ions in the solution. This is because the formula used to calculate pH approximates the negative of the base 10 logarithm (i.e. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution. Acidic solutions (solutions with higher concentrations of H + ions) are measured to have lower pH values than basic or alkaline solutions.
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It's made with a purpose to give you insight into your likes and push you to ponder on them yourself.In chemistry, pH ( / p iː ˈ eɪ tʃ/, historically denoting "potential of hydrogen" (or "power of hydrogen") is a scale used to specify the acidity or basicity of an aqueous solution. Note: This Gay Quiz should not be the deciding factor for you. If you are still doubtful, a consultation with an impartial guide like a therapist or counselor would help you gain more confidence and sort out your feelings and fears. It mainly concerns parents who would want to know such a significant detail about their child first. While coming out on social media or in some other way to the general public would be spectacular, you'd want to share the experience with your family and close friends first. Remember, you are precious to them, and many families would support their close ones even if they are not supportive of the outsiders. Are they supportive? How do they speak of the LGBT community ? These should be good indicators of their opinions and positions. Share a few stories of your friends, celebrities, etc. Do you have gay acquaintances in common? Talk about them. If you are unsure of how people around you would react, gauge their opinions discreetly.