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ph
| Question | Answer |
|---|---|
| Define pH | -log10(H+) |
| wht does pure water mean | means number of h+ ions equal the number of OH- ions,but the substance is not always neutral depending on the temperature for pH |
| 2 limitations of pH scale | limited to aqueous solutions |
| whats a diprotic acid | one molecule of h2so4 dissociates to produce 2 h+ ions |
| how can ka be described | dissocation reaction:H2O-H3O+A- |
| what does ka and kw represent | Ka=how much an acid ionises Kw=How much water ionises |
| factors that affect the ph of a solution | 1.temperature 2.tendency to dissociate 3.Concentration |
| Kc | equilibirum constant |
| whats a concentrated solution | a large amount of solute relative to volume of solvent |
| whats a acid base indcator | a substnace that changes colour as the Ph of a substance changes |
| whats the equivalence points | where neutralisation occurs |
| methyl orange | Range-3.1-4.4,colour in acid-red or pink,colour in base orange/yellow |
| pH range for litmus | 5-8 |
| phenolphthalein | range-8.3-10,colour in acid-colourless,colour in base-pink |
| OILRIG | oxidatio is loss and reduction is gain |
| whats a conjugate base pair according to bronstead | when 2 substances differ by a h+ ion |
| what does it mean when it asks for ion concentration | The pH but a step back so 10 to the power minus |
| whats the expression for the ionic product of water | h+ and OH- |
| what makes a indicator suitable for a titration | it has to be in the range of the equivalence point/vertical point |
| how is Ma usually represented in a question | e.g 0.002 M solution of methanoic acid |
| how is concentration affected by molecules | the more molecules the less the pH,e.g 1M HCL has a ph of 0 while a 0.1M has a ph of 2 |
| what is ammonia considerd | its considered a weak base since the backward reaction is favourite ,only a small amount of OH- ions are present |
| why is no indicator used in a tittration curve experiment | no indicator is needed as the ph curve tells you where the end point is |
| what is a titration curve | shows how ph changes during a tittration,to also determine equivalence point |
| what happens if a weak base is titrated against a weak acid | a clear titration curve will not be obtained,cause of a slow gradual ph change making ti difficult to detetct an equivalence point |
| Molarity formula | (v)(m)/N1=(v2)(M2)/N2 |
| when do we use RICE | products/reactants |
| how to find moles with volume | concentration times volume |
| how else can you find pH | doing -log with Ma/concentration |
Created by:
jeromepomy