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Acids and Bases in Solution
Transcript of Acids and Bases in Solution
Strengths of Acids and Bases
The more H+ ions in solution the stronger the acid.
The more OH- ions in solution the stronger the base.
The relationship between H+ and OH- is…
As H+ the OH- and as the H+ the OH- .
You should now be able to...
1. Tell whether a substance is an acid or base.
2. Describe what ph 7 means.
3. Draw a pH scale.
4. Be able to use the pH scale to determine the strength of an acid or base.
pH Measurements and Bases
Bases range from 7.00001 – 14.0
The closer you get to 14.0 the stronger the base.
The closer you get to 7.0 the weaker the base.
Bases in Solution
When Bases dissolve in water (go into solution), they produce ions.
NaOH Na + OH
Bases produce hydroxide ions in solution.
Acids in Solution
The term solution describes when something is dissolved in water.
When acids dissolve in water (go into solution), they produce ions.
HCl H + Cl
Acids produce hydrogen ions in solution.
These ions react with water to form hydronium ions (H O+).
Measuring Acid and Base Strength
Acid and Base strength is measured by pH.
pH means “percent hydronium” ion (H O+) concentration.
As the “percent hydronium” ion concentration [H O+] goes up, the pH number goes down.
As the “percent hydronium” ion concentration [H O+] goes down, the pH number goes up.
pH Measurements and Neutral
In-between acids and bases is an area called neutral.
Neutral has a pH of 7.0.
At pH 7.0, there are equal amounts of hydronium ions and hydroxide ions.
pH 7.0 is neither acid or base.
pH Measurements and Acids
The pH scale runs from 0 to 14.
Acids range from 0 – 6.999999
The closer you get to 0 the stronger the acid.
The closer you get to 7.0 the weaker the acid.
The pH Scale