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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

Which acid is better to use in the laboratory titrations H2SO4 or HCL why?

It depends on the specific requirements of the titration. HCl is a strong acid and may be preferred for titrations where a strong acid is needed, while H2SO4 is a diprotic acid that may be used for more complex reactions requiring two acidic protons. The choice between the two will depend on the specific characteristics of the reaction being studied.

Why mohr titration must be perform at a pH of neutral?

The reaction has to be carried out at neutral conditions because in acid the chromate indicator concentration decreases due to the reaction with the H+ ions, forming HCrO4-. It cannot be in too basic of a solution (greater than 10.5) because then silver hydroxide will form before the silver chromate can form.

What is over-titration?

Over-titration refers to the process of adding too much titrant during a titration, resulting in an endpoint that goes beyond the equivalence point. This can lead to inaccurate results as the excess titrant can skew the calculations.

What is the control variable in titration?

In a titration experiment, the control variable is the volume of the titrant added to the analyte solution at each step. This volume should be kept consistent throughout the experiment to ensure accurate and reliable results.

What are complexometric titration method?

Complexometric titration is a type of volumetric analysis used to determine the concentration of metal ions in a solution by forming complexes with a specific reagent. In this method, a chelating agent is typically used to form a stable complex with the metal ion, and the endpoint of the titration is usually determined using a colorimetric indicator or a pH meter. This technique is commonly employed in the analysis of a variety of metal ions in solution.

What is a potentiometric titration?

Potentiometric titration is a technique used to determine the concentration of an analyte in a solution by measuring the potential difference between two electrodes in the solution. It involves adding a titrant solution of known concentration to the analyte solution until the equivalence point is reached, where the two solutions react completely. The equivalence point is determined by the inflection point on the titration curve, and the concentration of the analyte can be calculated from this data.

How do you determine ka from a titration curve?

Assuming you know how to find the equivalence point on the titration curve, and assuming it is not [strong acid/strong base] or [weak acid/weak base], all you need to do is find the half equivalence point, which gives you the pKa of the first solution.

Then to get the Ka, you go 10-pKa .

What are the type of conductometric titration?

The types of conductometric titrations include strong acid-strong base titrations, weak acid-strong base titrations, weak base-strong acid titrations, and precipitation titrations. Conductometric titrations measure the change in electrical conductivity of a solution as a titrant is added, allowing for the determination of the endpoint of the reaction.

What is iodometric titration?

In this titration iodine is liberated ....

Added:

... from (excess of) iodide by an oxidant. The Iodine is then titrated with thio (di-sodium thio-sulfate) and starch as indicator added just before the expected equivalence point.

In permanganate titration's why is nitric acid not used?

Nitric acid is not used in permanganate titrations because it can react with permanganate ions and reduce them before they can oxidize the analyte. This interference can lead to inaccurate results in the titration process. Instead, sulfuric acid is often used as the acidifying agent in permanganate titrations.

What is difference between external and internal indicators used in titration?

Internal indicators that are used in titration exist in the titration reaction as either a reactant or a product. External indicators is added to the reaction mixture, but does not exist in the reaction.

How you measure calcium concentration with EGTA titration method?

In the EGTA titration method, calcium concentration is measured by titrating a known concentration of EGTA (a calcium chelator) with the solution containing calcium ions. As EGTA binds to calcium ions, the solution's color changes due to the formation of a complex. By monitoring the color change using a spectrophotometer or indicator dye, you can calculate the concentration of calcium ions present in the solution.

What is the role of adsorption indicators in precipitation titration?

Adsorption indicators are used in precipitation titrations to detect the endpoint of the titration by forming a visible complex or precipitate with the analyte or titrant. These indicators help in indicating the completion of the reaction and the formation of a precipitate, which shifts the equilibrium towards the indicator-precipitate complex. This visual change signifies the endpoint of the titration process.

What kind of indicators are used in precipitation titration?

Indicators used in precipitation titrations are typically complexometric indicators that form colored complexes with the analyte ions. These indicators change color when the endpoint of the titration is reached, signaling the completion of the precipitation reaction. Common complexometric indicators include EDTA, Eriochrome Black T, and Calconcarboxylic acid.

Which companies would use titrations?

Companies in various industries such as pharmaceuticals, food and beverage, environmental testing, and chemical manufacturing would use titrations for quality control, process monitoring, and research purposes. Titrations are valuable analytical techniques for determining the concentration of substances in a sample through precise volume measurements.

Why starch is used as indicator in iodometric titration?

Starch is used as an indicator in iodometric titration because it forms a blue color complex with iodine. This helps in visually detecting the endpoint of the titration, which is when all the iodine has been reacted with the analyte. The appearance of the blue color indicates that the reaction is complete.

Why is potassium iodide used in iodometric titrations instead of sodium iodide?

I would guess that this is so because of potassium's mass, being much more than, sodium's molar mass per ion. So can sodium iodide be used instead of potassium iodide? Perhaps, but maybe not to the same level effectiveness. Potassium molecules have been known to dissolve better than sodium molecules. One example is Potassium Chloride and Sodium Chloride thanks

What is direct titration?

A direct addition of standard titrant to the analyte (in stepwise way) in the presence of acid-base indictor till the reaction is complete and reaching the E.P ( color change of the indicator)

What are some applications of titration?

One important purpose is to titrate the dose of certain medications when discontinuing the medicine. This means to gradually decrease the dosage or amount of the drug so the body slowly adjusts to the change, thereby decreasing the incidence symptoms and side effects that my result from the withdrawal of the drug.

What is residual-titration?

Residual titration is a method used in analytical chemistry to determine the concentration of a substance in a sample by adding a reagent until no further reaction occurs. This endpoint is reached when the reaction is stoichiometrically complete, allowing for the calculation of the initial concentration of the substance being analyzed.

What is radiometric titration?

Radiometric titration is "regular" titration, but with the incorporation of a radioactive indicator to monitor the end-point. And that's right from the IUPAC Compendium of Chemical Terminology. If you need an example, use the link provided to a post on the radiometric titration of hexachloro-platinate (IV). It's a bit esoteric, but it will serve to exemplify the idea behind radiometric titration. It's pretty clear that when working with two precipitates (co-precipitation), the analyst would need a way to differentiate them. In the case cited, the application of radioactive cæsium-137 will permit the observer to more quickly and easily find a cutoff point at which to terminate the titration.

Why the oxidation reduction titration must be in acidic medium?

Hydrogen ion (acid) has extra electrons which can be donated so the reaction can take place, whereas oxygen can accept those ions to form water in the product. That's why redox reactions always start of in a acidic solution and end up in a neutral/basic solution.

What do you mean by argentometric titration?

Argentometric comes from the Latin word ''argentum''which means silver. Argentometric titrations are precipitation titrations based on the use of silver nitrate as the precipitating agent.For example in titrations of halide ions,divalent anions,mercaptans(Ag2S),Fatty acids etc. By Lukato Simon Makerere University Kampala,Uganda Tel.0782528726. Argentometric comes from the Latin word ''argentum''which means silver. Argentometric titrations are precipitation titrations based on the use of silver nitrate as the precipitating agent.For example in titrations of halide ions,divalent anions,mercaptans(Ag2S),Fatty acids etc. By Lukato Simon Makerere University Kampala,Uganda Tel.0782528726.

What is the precaution steps for titration?

  1. Wear appropriate personal protective equipment, such as gloves and safety goggles.
  2. Handle chemicals carefully and avoid spills.
  3. Set up equipment correctly and ensure it is clean and calibrated.
  4. Dispose of waste properly and clean up any spills immediately.