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Titrations
Titrations are used to measure the concentration of an unknown solution using a known solution while tallying the volumes. Several types of these include acid-base titrations, red-ox titrations, colorimetric titrations and gravimetric titrations.
959 Questions
Why oxalic acid is acidified before titration?
Oxalic acid is acidified before titration to provide a medium that favors the reaction of the analyte with the titrant while minimizing interference from other substances. Acidification ensures that the oxalic acid dissociates fully to its acidic form, allowing for a more accurate and precise titration.
What measuring instrument is used in titration?
A burette is typically used in titration to measure and deliver precise volumes of a solution with high accuracy. The burette allows for controlled dispensing of one solution into another until the reaction reaches its endpoint.
Why you useindicator in titration?
Most solutions used in titrations are colorless, therefore you cannot really estimate the equivalence point (the volume of added titrant that causes a stoechiometric reaction).
However, slight variations in other factors such as acidity (pH) can be detected by means of an indicator, which will change color accordingly. This will notify you when you have reached the equivalence point.
How do they use non-aqueous titration in pharmaceutical application?
"Titration" is the process of determining the concentration of one substance in another. When the titration is "non-aqueous", the substance which is being measured is present in a liquid other than water.
Why are titrations using permanganate performed in acidic solutions?
Titrations using permanganate are performed in acidic solutions to prevent the premature reduction of permanganate ion to colorless manganous ion. The acidic conditions stabilize the permanganate ion and ensure a more accurate endpoint detection during the titration.
What are the types of titration for vitamin C?
You titrate samples exactly the same as you did your standard. Record the initial and final volume of iodine solution required to produce the color change at the endpoint.
Titrating Juice Samples
- Add 25.00 ml of juice sample to a 125 ml Erlenmeyer flask.
- Titrate until the endpoint is reached. (Add iodine solution until you get a color that persists longer than 20 seconds.)
- Repeat the titration until you have at least three measurement that agree to within 0.1 ml.
Titrating Real Lemon
Real Lemon is nice to use because the maker lists vitamin C, so you can compare your value with the packaged value.
- Add 10.00 ml of Real Lemon into a 125 ml Erlenmeyer flask.
- Titrate until you have at least three measurements that agree within 0.1 ml of iodine solution.
- Vitamin C Tablet - Dissolve the tablet in ~100 ml distilled water. Add distilled water to make 200 ml of solution in a volumetric flask.
- Fresh Fruit Juice - Strain the juice through a coffee filter or cheese cloth to remove pulp and seeds, since they could get stuck in the glassware.
- Packaged Fruit Juice - This also may require straining.
- Fruits & Vegetables - Blend a 100 g sample with ~50 ml of distilled water. Strain the mixture. Wash the filter with a few milliliters of distilled water. Add distilled water to make a final solution of 100 ml in a volumetric flask.
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What is argentimetric titration?
In analytical chemistry, argentometry is a type of titration involving the silver(I) ion. Typically, it is used to determine the amount of chloride present in a sample. The sample solution is titrated against a solution of silver nitrate of known concentration. Chloride ions react with silver(I) ions to give the insoluble silver chloride:Cl− (aq) + Ag+ (aq) → AgCl (s) (Ksp = 1.70 × 10−10)
Phenolphthalein changes color in the pH range of 8.2-10, which makes it suitable for acid-base titrations with equivalence points in the pH range of 7-9. It remains colorless in acidic solutions and turns pink in basic solutions, providing a clear visual indication of the endpoint of the titration within the desired pH range.
