Titrations ChristopherWhitehead Language College滴定法克里斯托弗怀特海语言学院.pptVIP

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Titrations ChristopherWhitehead Language College滴定法克里斯托弗怀特海语言学院.ppt

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Titrations ChristopherWhitehead Language College滴定法克里斯托弗怀特海语言学院

Calculating concentrations Standard solutions Calculating concentrations in g/dm3 Calculating concentrations in mol/dm3 Calculating concentration Calculating concentrations in mol/dm3 Titration How does titration work? How does titration work? Titration calculations Titration calculations Titration calculations Titration calculations Titration apparatus Making accurate measurements Choosing suitable measuring apparatus Plotting a pH curve pH curve for strong alkali and strong acid Producing different pH curves End points pH ranges of indicators Indicators and pH ranges Choosing the right indicator True or false? Glossary Anagrams Multiple-choice quiz Teacher notes This multiple-choice quiz could be used as a plenary activity to assess students’ understanding of halogens. The questions can be skipped through without answering by clicking “next”. Students could be asked to complete the questions in their books and the activity could be concluded by the completion on the IWB. acid – A substance which donates H+ ions. alkali – A soluble base, which releases OH– ions in solution. concentration – A measure of how much solute is dissolved in solution. endpoint – The point during titration when the indicator changes colour. indicator – A substance that changes colour according to the pH of a solution. neutralization – A reaction between an acid and an alkali. pH – A measure of the H+ ion concentration in a solution. strong – An acid or alkali that dissociates fully in solution. standard solution – A solution whose concentration is known. titration – Analytical process used to accurately measure concentration weak – An acid or alkali which does not dissociate fully in solution. Photo credit: Charles D. Winters / Science Photo Library Demonstration of an acid-base titration using the indicator phenolphthalein. An alkaline solution is in the flask with a few drops of the indicator added to give a purple colour. Acid is slowly added from the burette above. When the acid has ne