Presentation ~ above theme: "How is pH defined? The pH that a systems is the an unfavorable logarithm the the hydrogen-ion concentration. The pH might be stood for mathematically, using the."— Presentation transcript:




You are watching: The negative logarithm of the hydrogen ion concentration

1 exactly how is pH defined? The pH that a systems is the negative logarithm that the hydrogen-ion concentration. The pH may be stood for mathematically, making use of the adhering to equation: pH = –log In pure water or a neutral solution, = 1 × 10–7M, and the pH is 7. PH = –log(1 × 10–7) = –(log 1 × log in 10–7) = –(0.0 + (–7.0)) = 7.0 If the the a systems is better than 1 × 10–7M, the pH is much less than 7.0. If the that the equipment is less than 1 × 10–7M, the pH is better than 7.0.

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In pure water or a neutral solution, = 1 × 10–7M, and also the pH is 7. PH = –log(1 × 10–7) = –(log 1 × log 10–7) = –(0.0 + (–7.0)) = 7.0. If the that a systems is better than 1 × 10–7M, the pH is less than 7.0. If the that the solution is much less than 1 × 10–7M, the pH is greater than 7.0.">

2 Sample problem: Calculating pHWhat is the pH the a systems with a hydrogen-ion concentration the 4.2 × 10–10M? (contd.)

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3 Sample problem: Calculating pHCalculate the pH of a systems with a hydroxide concentration that 1.2 × 10–3M.

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5 How room and connected in one aqueous solution?The reaction in which water molecules create ions is dubbed the self-ionization of water. This reaction have the right to be written as a straightforward dissociation. H2O(l) ⇄ H+(aq) + OH–(aq) The self-ionization that water occurs to a very small extent. In pure water at 25°C, the concentration the hydrogen ions is only 1 × 10–7M. The concentration of OH– is also 1 × 10–7M since the numbers of H+ and also OH– ions are equal in pure water. Any kind of aqueous solution in which and are equal is a neutral solution.

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and connected in one aqueous solution" title="The reaction in i m sorry water molecules produce ions is dubbed the self-ionization that water. This reaction can be created as a simple dissociation. H2O(l) ⇄ H+(aq) + OH–(aq) The self-ionization the water occurs to a very tiny extent. In pure water in ~ 25°C, the concentration of hydrogen ion is only 1 × 10–7M. The concentration the OH– is likewise 1 × 10–7M because the numbers of H+ and also OH– ions are equal in pure water. Any type of aqueous solution in which and also are equal is a neutral solution.">

6 for aqueous solutions, the product of the hydrogen-ion concentration and also the hydroxide-ion concentration equals 1.0  10–14. = 1.0  10–14 This equation is true for all dilute aqueous remedies at 25°C. The product of the concentration of the hydrogen ions and the hydroxide ions in water is referred to as the ion-product consistent for water (Kw). Kw = × = 1.0 × 10–14 A equipment in which is better than is one acidic solution. In acidic solutions, the is better than 1 × 10–7M. A an easy solution is one in i m sorry is much less than . The of a an easy solution is less than 1 × 10–7M. Straightforward solutions are additionally known together alkaline solutions.

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= 1.0  10–14. This equation is true for all dilute aqueous solutions at 25°C. The product the the concentrations of the hydrogen ions and the hydroxide ions in water is called the ion-product continuous for water (Kw). Kw = × = 1.0 × 10–14. A systems in which is better than is an acidic solution. In acidic solutions, the is better than 1 × 10–7M. A an easy solution is one in i beg your pardon is less than . The that a straightforward solution is much less than 1 × 10–7M. An easy solutions are also known together alkaline solutions.">

7 You can use this equation come convert in between pH and pOHKw = pH + pOH Kw constantly equals 14 So.. PH + pOH = 14 You can use this equation to convert in between pH and pOH 7

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8 Sample problem: Calculating pHCalculate the pH that a solution with a pOH that 12. 8

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9 Sample problem: Calculating pHCalculate the pOH that a systems with a pH of 9. 9

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10 Sample problem: Calculating pHCalculate the hydrogen ion concentration the a solution with a pH the 8.5.

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11 Sample problem: Calculating pHCalculate the hydrogen ion concentration that a equipment with a pOH the 13.5. 11

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