Flashcards
Titration
Cards in this deck (17)
- 1What is a Primary StandardA substance used in volumetric analysis that is of such high purity and stability that it can be used to prepare a solution of accurately known concentration
- 2Conditions for a primary standardPurity
Accurate concentration
Free from moisture
Stable and unaffected by air
Readily soluble in distilled water
High molar weight solid
Reacts instantaneously - 3Step 1 for a titrationPreparing the burette
- 4Steps for preparing a Burette1) Clean with distilled water
2) Rinse with the unknown acid/base
3) Use funnel to fill up burette
4) Open tap to fill to mark with no bubbles - 5Step 2 for titrationPrepare pipette and transfer standard solution
- 6How to prepare a pipette1) Using a bulb, rinse pipette several times
2) Rinse with small volumes of standard solution
3) Fill with standard solution
4) Bottom of meniscus is on the marked line
5) Aliquot added to volumetric flask - 7Step 3Perform the titration
- 8Performing the titration1) Add the indicator to the volumetric flask
2) Open tap slowly
3) Continue adding until a slight colour change occurs
4) Repeat 4 times (rough + 3 proper times) - 9Step 4Calculating the concentration of the unknown
- 10How to do the calculation1) Write the balanced equation for the neutralisation reaction
2) Identify the mole coefficients in the balanced equation
3) Find the moles of known concentration
4) Multiple or divide by the mole coefficients to obtain the mole of the unknown
5) Use molarity formula to find the concentration - 11TitrantThe solution that is added from the burette
- 12AliquotA known volume of a liquid
- 13TitreThe volume of solution delivered from the burette that achieves an end point
- 14End PointThe stage in a titration at which the indicator just changes colour
- 15Suitable indicators for weak acid/strong basePhenolphthalein
- 16Suitable indicators for strong acid/strong basePhenolphthalein
Bromothymol Blue
Methyl Orange - 17Suitable indicators for strong acid/weak baseMethyl Orange
Bromothymol Blue
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- Flash cards to perform a titration
- Created by
- Georgi Georgieff
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