Download presentation
Presentation is loading. Please wait.
2
pH scale Measures the amount of H + in a solution. Scale used to measure whether a substance is an acid or a base. Lower numbers are acids. Higher numbers are bases
3
Examples Which of the following pH values represents the strongest acid? A) 12.0 B) 9.0 C) 2.0 D) 7.0 Which of the following pH values represents the weakest base? A) 12.0 B) 9.0 C) 2.0 D) 7.0
4
pOH scale Measures the amount of OH - in a solution. The pH and pOH scales are related by the following equation. pH + pOH = 14 Ex: What is the pOH of a solution if its pH is 4? Is it an acid, base, or neutral? Ex: What is the pH of a solution if the pOH is 9? Is it an acid, base, or neutral?
Similar presentations
![PH. There is a formula to find pH pH = -log [H + ] or pH = -log [H 3 O + ] – (brackets around a substance means that substances concentration in molarity)](/8/2422811/big_thumb.jpg "PH. There is a formula to find pH pH = -log [H + ] or pH = -log [H 3 O + ] – (brackets around a substance means that substances concentration in molarity)>")
![Acids and Bases. Ionization of Water H 2 O + H 2 O H 3 O + + OH - K w = [H 3 O + ][OH - ] = 1.0 10 -14.](/8/2465222/big_thumb.jpg "Acids and Bases. Ionization of Water H 2 O + H 2 O H 3 O + + OH - K w = [H 3 O + ][OH - ] = 1.0 10 -14.>")
![PH Scale. Ion product constant for water K w H 2 O H + + OH - K w = [H + ] [OH - ] = 1.0 X 10 -14 mol/L Since [H + ] = [OH - ] for water Then each equals.](/9/2504100/big_thumb.jpg "PH Scale. Ion product constant for water K w H 2 O H + + OH - K w = [H + ] [OH - ] = 1.0 X 10 -14 mol/L Since [H + ] = [OH - ] for water Then each equals.>")
![Continuing into the world of acids and bases…. pH of a solution is the negative logarithm of the hydrogen ion concentration pH = -log [H + ] This.](/9/2504106/big_thumb.jpg "Continuing into the world of acids and bases…. pH of a solution is the negative logarithm of the hydrogen ion concentration pH = -log [H + ] This.>")
![Calculating pH and pOH. pH pH = - log [H + ] [H + ] = the hydrogen ion concentration pH: “potential of hydrogen” - A way of expressing the hydrogen ion.](/17/5302527/big_thumb.jpg "Calculating pH and pOH. pH pH = - log [H + ] [H + ] = the hydrogen ion concentration pH: “potential of hydrogen” - A way of expressing the hydrogen ion.>")
![Chapter 19 Notes, part III pH and [H + ]. Hydrogen and hydroxide in H 2 O Working with the Arrhenius acid definition, we say that acids are: –HX H +](/34/8310460/big_thumb.jpg "Chapter 19 Notes, part III pH and [H + ]. Hydrogen and hydroxide in H 2 O Working with the Arrhenius acid definition, we say that acids are: –HX H +>")
![Chemistry Notes pH and [H + ] Working with the Arrhenius acid definition, we say that acids produce hydrogen ions: HX H + + X - And bases produce hydroxide.](/34/8310468/big_thumb.jpg "Chemistry Notes pH and [H + ] Working with the Arrhenius acid definition, we say that acids produce hydrogen ions: HX H + + X - And bases produce hydroxide.>")