Download presentation
Presentation is loading. Please wait.
1
18-3 Hydrogen Ions and pH The self-ionization of water is …. HOH ↔ H+ + OH- Ion Product Constant for Water Kw =[H+][OH-]=1.0 x 10-14M2 Use this to solve for [H+] or [OH-] given the other. (See example problem 1 pg 651)
2
pH and pOH The pH scale was 'invented' by Soren Sorenson to help wine-makers keep track of acidity in wine. The pH scale starts at 0 (very acid) to 14 (very basic) pH = -log[H+] pOH = -log[OH-] pH + pOH = 14 See Example problem 2 and practice problems pg 653.
3
[H+] and [OH-] from pH [H+]= log-1(-pH) See example problem 4 and practice problems page 655. Once you have the [H+], you can solve for Ka. See example problem 5 p 657. Once you solve for [H+], you can solve for [OH-] using the Kw equation.
![[H+] and [OH-] from pH [H+]= log-1(-pH) See example problem 4 and practice problems page 655.](http://images.slideplayer.com./28/9367933/slides/slide_3.jpg "Once you have the [H+], you can solve for Ka. See example problem 5 p 657. Once you solve for [H+], you can solve for [OH-] using the Kw equation..")
4
Indicators Indicators can are substances that change color in the presence of acids and/or bases. See the hand-out chart for indicators.
Similar presentations
![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.>")
![© Carey Munoz First, fold your paper in half like this. Not this. pH, pOH, [H + ], [OH - ]](/18/6142589/big_thumb.jpg "© Carey Munoz First, fold your paper in half like this. Not this. pH, pOH, [H + ], [OH - ]>")
![pH scale Logarithmic scale expressing the H + concentration, [H + ]. If the pH changes by a factor of 1, the [H + ] changes by a factor of 10. pH =](/22/6410049/big_thumb.jpg "pH scale Logarithmic scale expressing the H + concentration, [H + ]. If the pH changes by a factor of 1, the [H + ] changes by a factor of 10. pH =>")
![The pH Scale. pH Scale We use this scale to measure the strength of an acid or base. pH is defined as the –log[H+] pH can use the concentration of hydronium.](/33/8176214/big_thumb.jpg "The pH Scale. pH Scale We use this scale to measure the strength of an acid or base. pH is defined as the –log[H+] pH can use the concentration of hydronium.>")
![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.>")
![What is pH?. Ion Product Constant for Water H 2 O(l) H + (aq) + OH - (aq) Keq = Kw = [H + ] x [OH - ] The ion product constant for water (Kw)](/34/8359155/big_thumb.jpg "What is pH?. Ion Product Constant for Water H 2 O(l) H + (aq) + OH - (aq) Keq = Kw = [H + ] x [OH - ] The ion product constant for water (Kw)>")
