Download presentation
Presentation is loading. Please wait.
1
The pH scale
2
pH scale This scale is used to determine the concentrat’n of H + ions versus OH - ions Things that are neutral are pH 7, acids are below 7 and bases are above 7
3
pH scale As you go from pH 7 to pH 8 there are 10 times more OH - ions Every level of the pH scale represents a ten fold (ten times) increase in the concentration of the H + or OH - ions
4
pH Scale So how much more acidic is lemon juice with pH 2 than saliva pH 6? 10 000! How much more basic is bleach pH 13 than sea water pH 8
5
Finish in class work Pg 225 1-3
Similar presentations
![PH and Concentration. pH Recall water H 2 O H + + OH - Every water molecule produces one hydrogen ion and one hydroxide ion At equilibrium, K eq = [products]](/8/2364772/big_thumb.jpg "PH and Concentration. pH Recall water H 2 O H + + OH - Every water molecule produces one hydrogen ion and one hydroxide ion At equilibrium, K eq = [products]>")
![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.>")
![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.>")
![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.>")