Several factors can cause errors in titration findings, including misreading volumes, mistaken concentration values or faulty technique . Care must be taken as the solution of the known concentration is introduced into a specific volume of the unknown through laboratory glassware such as a burette or pipette.
What can affect titration results?
- Measuring method.
- Instrument (instrument uncertainty/abrasion of the burette)
- Electrodes (electrode uncertainty/alteration of electrodes)
- Handling.
- Balance (weighing error)
- Temperature.
What causes over titration?
Over-titration is a state where there is more iodine present in the vessel than water (general definition). When over-titration occurs the vessel will become very dark as a result of the abundance of iodine present inside the vessel.
How can we avoid error in titration?
- Check the calibration of the balance. ...
- Verify that the primary standard is properly dried. ...
- Verify the precision of the glassware. ...
- Use sufficient quantities of analyte and titrant. ...
- Realize the limitations of the equipment.
What is a titration error?
In a titration, the primary systematic error is the endpoint determination. The difference between the equivalence point and the measured end point is called the titration error. ... The result is that the volume of titrant delivered is too large , giving a larger final concentration than the true value.
What does a burette look like?
A burette is a graduated glass tube with a tap at one end , for delivering known volumes of a liquid, especially in titrations. It is a long, graduated glass tube, with a stopcock at its lower end and a tapered capillary tube at the stopcock’s outlet. ... A volumetric burette delivers measured volumes of liquid.
What happens if you over titrate a solution?
If you overshoot the endpoint in titration of the KHP, an error will happen in your calculations for the molarity of NaOH you are standardizing . ... Adding more of the base needed to reach the equivalence would mean you have higher volume which will make the calculated concentration of NaOH lesser.
What are two possible sources of error specific to titration?
Several factors can cause errors in titration findings, including misreading volumes, mistaken concentration values or faulty technique . Care must be taken as the solution of the known concentration is introduced into a specific volume of the unknown through laboratory glassware such as a burette or pipette.
What is a good percent error for titration?
All burette readings should include 2 decimal places in which the second figure is either 0 or 5. An error of one drop in a volume of 25.00 cm 3 gives a percentage error of 0.2% for each reading. You could try to pull it all together – measurements and procedures.
Do air bubbles affect titration?
Explanation: If we do not remove the air bubble from the nozzle of burette errors will be occurring in a titration. Titration is an analytical method. Because air bubbles cause errors in volume readings .
What problem arises if too much indicator is used in the titration?
If a large amount of indicator is used, the indicator will effect the final pH, lowering the accuracy of the experiment .
How do you ensure accuracy in a titration?
- Meniscus at eye level. To avoid parallax error.
- White tile. To see end point clearer.
- Remove funnel before titrating. Increases the vol making the titre smaller.
- Dropwise addition. ...
- No bubbles in pipette & burette at the tip. ...
- Swirling during titration. ...
- Few drops of indicator. ...
- Repeat the titration.
What is end point in titration?
end point: the point during a titration when an indicator shows that the amount of reactant necessary for a complete reaction has been added to a solution .
Can random errors be corrected?
The two main types of measurement error are random error and systematic error. Random error causes one measurement to differ slightly from the next. It comes from unpredictable changes during an experiment. ... Random errors cannot be eliminated from an experiment , but most systematic errors may be reduced.
What is an example of an experimental error?
For example, errors in judgment of an observer when reading the scale of a measuring device to the smallest division . 2. Environmental. For example, unpredictable fluctuations in line voltage, temperature, or mechanical vibrations of equipment.
What is random error?
Random error is a chance difference between the observed and true values of something (e.g., a researcher misreading a weighing scale records an incorrect measurement). ... With random error, multiple measurements will tend to cluster around the true value.
