Chemistry /PH and Indicators Flashcards Part 1
Define PH
Ph = -log10[H+] or Ph= -log10[ H3+O]
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Key Terms
Term
Definition
Define PH
Ph = -log10[H+] or Ph= -log10[ H3+O]
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What is the ph scale
a scale that runs from 0 to 14 that indicated its level of acidity or alkalinity
Give three limitations of the pH scale
The pH is inly useful/valid in the 0-14 range
The pH scale only applies to aqueous solutions
The pH scale does not work with very concentrated solutio...
Arrhenious definition for an acid
dissociates in water to produce H+ or H3O+ ions
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Arrhenious definition for a stong base
dissociated fully in water to produce OH- ions
Arrhenious definition for a weak base
dissociates only slightly in water to produce OH- ions
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| Term | Definition |
|---|---|
Define PH | Ph = -log10[H+] or Ph= -log10[ H3+O] |
What is the ph scale | a scale that runs from 0 to 14 that indicated its level of acidity or alkalinity |
Give three limitations of the pH scale | The pH is inly useful/valid in the 0-14 range
The pH scale only applies to aqueous solutions
The pH scale does not work with very concentrated solutions |
Arrhenious definition for an acid | dissociates in water to produce H+ or H3O+ ions |
Arrhenious definition for a stong base | dissociated fully in water to produce OH- ions |
Arrhenious definition for a weak base | dissociates only slightly in water to produce OH- ions |
Arrhenious definition for monobasic acid | each molecule dissociated to produce one H+ ions in solution |
Arrhenious definition for dibasic acid | each molecule dissociates to produce two H+ ion in solution |
Arrhenious definition for tribasic acid | each molecule dissociated to produce three H+ ions in solution |
Arrhenious definition for a base | dissociated in water to produce OH- ions |
Arrhenious definition for strong base | dissociates fully in water to produce OH- ions |
Arrhenious definition for weak base | dissociates only slightly in water to produce OH- |
Arrhenious definition for monobasic base | each molecule dissociated to produce one OH- ion in solution |
Arrhenious definition for a dibasic base | each molecule dissociated to produce two OH- ions in solution |
Arrhenious definition for tribasic base | each molecule dissociated to produce three OH- ions in solution |
Two substances with the same pH | have the same [H+]
Have the same pOH
Have the same [OH-] |
do acids still have an [OH-]? | yes they do… just very low - if asked for the [OH-] of an acid, treat ‘as if’ it is a base |
Do Bases still have H+? | yes they do…just very low - if asked for the [H+] of an acid, treat it ‘as if’ it is an acid |
what are acid base inicators | substances which change colour according to the ph of the solution in which they are placed |
name a acid base indicator which change colour at 3-5 , 5-8 , 8-10 | Methyl orange 3-5 yellow(base) to red(acid)
Litmus 5-8 Blue(base)to red(acid)
Phenolphthalein 8-10 Pink(base) to colourless (Acid) |