How do you ensure accuracy in a titration?
Terms in this set (9)
- 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 are two possible sources of error when titrating?
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 factors affect titration?
The Titration process is influenced by the following factors:
- Measuring method.
- Instrument (instrument uncertainty/abrasion of the burette)
- Electrodes (electrode uncertainty/alteration of electrodes)
- Handling.
- Balance (weighing error)
- Temperature.
How can we avoid error in titration?
2)Their should not be any leakage from the burette during titration. 3)Keep your eye in level with the liquid surface while taking the burette reading or while reading the pipette or measuring flask etc. 4)Always read lower meniscus in case of colourless solution and upper meniscus in case of coloured solutions.
What factors affect a redox titration?
Many factors such as solution temperature and pH, irreversible reactions, slow electrode kinetics, non-equilibrium, presence of multiple redox couples, electrode poisoning and …
Why KMnO4 is a self indicator?
Answer. KMnO4 solutions are dark purple. When used as a titrant, as soon as the endpoint is reached and the KMnO4- is in excess, the solution has a permanent pink hue (provided that the solution is initially colorless). Thus KMnO4 acts as its own indicator.
Why is an indicator not used in redox titration?
Some redox titrations do not require an indicator, due to the intense color of the constituents. For instance, in permanganometry a slight persisting pink color signals the endpoint of the titration because of the color of the excess oxidizing agent potassium permanganate.
Why is this redox titration an easy system to monitor?
For a redox titration it is convenient to monitor the titration reaction’s potential instead of the concentration of one species. You may recall from Chapter 6 that the Nernst equation relates a solution’s potential to the concentrations of reactants and products participating in the redox reaction.
What is the purpose of a redox titration?
Redox titration determines the concentration of an unknown solution (analyte) that contains an oxidizing or reducing agent. Not all titrations require an external indicator. Some titrants can serve as their own indicators, such as when potassium permanganate is titrated against a colorless analyte.
Which of the following is a self indicator?
In the presence of a reducing agent, KMnO4 acts as self-indicator and changes color from pink to colorless. Because in MnO4− Mn is in +7 oxidation state and is in highest oxidation state. Thus will tend to get reduced and easily takes electrons and being a charge transfer complex, shows intense color.
What element is being reduced?
1 Answer. Stefan V. Nitrogen is being reduced.
What is reduced in this reaction?
A reduction reaction is one in which a reactant in a chemical reaction gains one or more electrons. Reduction reactions always occur in conjunction with oxidation reactions, in which a reactant loses one or more electrons. A reduction reaction is only one half of a redox reaction.
What does it mean when something is reduced?
to bring down to a smaller extent, size, amount, number, etc.: to reduce one’s weight by 10 pounds. to lower in degree, intensity, etc.: to reduce the speed of a car. to bring down to a lower rank, dignity, etc.: a sergeant reduced to a corporal.
What does it mean when a chemical is reduced?
Reduction is a chemical reaction that involves the gaining of electrons by one of the atoms involved in the reaction between two chemicals. The term refers to the element that accepts electrons, as the oxidation state of the element that gains electrons is lowered. This is called redox.