Argentometric titration. Definition: The process of determining the quantity of a sample by adding measured increments of a titrant until the end-point, at which. automatic titrator will be used to perform the titration, and to obtain the titration curve. Background. Argentometric Titrations. In order for a titrimetric method to be . A titration in which Ag+ is the titrant is called an argentometric titration. Table provides a list of several typical precipitation titrations.

Author: Akinor Malalkis
Country: Syria
Language: English (Spanish)
Genre: Sex
Published (Last): 2 February 2013
Pages: 77
PDF File Size: 20.34 Mb
ePub File Size: 7.60 Mb
ISBN: 325-5-95625-276-9
Downloads: 71255
Price: Free* [*Free Regsitration Required]
Uploader: Goltim

The first reagent is added in excess and the second reagent used to back titrate the excess. Calcium acetate “fixes” free chlorine, precipitates carbonates, and titraitons the resultant solution.

The pH also must be less than 10 to avoid the precipitation of silver hydroxide. In this section we demonstrate a simple method for sketching a precipitation titration curve.

Precipitation Titrations – Chemistry LibreTexts

Home Questions Tags Users Unanswered. The stoichiometry of the reaction requires that. Waylander 5, 1 10 Sign up or log in Sign up using Google. We call this type of titration a precipitation titration.

The scale of operations, accuracy, precision, sensitivity, time, and cost of a precipitation titration is similar to those described elsewhere in this chapter for acid—base, complexation, and redox titrations.

Calculate the titration curve for the titration of A further discussion of potentiometry is found in Chapter The quantitative relationship between the titrand and the titrant is determined by the stoichiometry of the titration reaction. The sample solution is titrated against a solution of silver nitrate of known concentration. The solution needs to be near neutral, because silver hydroxide forms at high pH, while the chromate forms H 2 CrO 4 at low pH, reducing the concentration of chromate ions, and delaying the formation of the precipitate.


A typical calculation is shown in the following example. Before precipitation titrimetry became practical, better methods for identifying the end point were necessary.

The blue line shows the complete titration curve. They are most often used for determination of chloride ions, but they can be used also for other halides bromide, iodide and some pseudohalides thiocyanate. A better fit is possible if the two points before the equivalence point are further apart—for example, 0 mL and 20 mL— and the two points after the equivalence point are further apart.

Chloride ions react with silver I ions to give the insoluble silver chloride: A comparison of our sketch to the exact titration curve Figure 9.

For example, after adding Because this equation has two unknowns—g KCl and g NaBr—we need another equation that includes both unknowns. Our goal is to sketch the titration curve quickly, using as few calculations as possible.

Argentometric (silver nitrate) titrations overview

See the text for additional details. To calculate the concentration of Cl — we use the K sp expression for AgCl; thus. There are two precipitates in this analysis: Precipitation titrations titrationz can be extended to the analysis of mixtures argentometeic that there is argentomertic significant difference in the solubilities of the precipitates.

The red arrows show the end points. The sample contains 0. Additional results for the titration curve are shown in Table 9. A second type of indicator uses a species that forms a colored complex with the titrant or the titrand. They adsorb on the AgCl surface, imparting a negative charge to the particles. Solution There are two precipitates in this analysis: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


As we learned earlier, the calculations are straightforward. It is not suitable for titrating against chloride anions because it binds to AgCl more strongly than chloride does. Argetnometric, we use alkalimetric titration to calculate the real concentration of table vinegar.

As we have done with other titrations, we tittations show how to calculate the titration curve and then demonstrate how we can quickly sketch a reasonable approximation of the titration curve. What are some example of the use of argentometric titration? All chlorides are dissolved out of the residue, and titrated.

Argentometric (silver nitrate) titrations overview

Calculate pCl after the equivalence point by first calculating the concentration of excess AgNO 3 and then calculating the concentration of Cl — using the K sp for AgCl. Chemistry Stack Exchange works best with JavaScript enabled. Retrieved from ” https: Titration is in aqueous solution against a solution of silver nitrate of known concentration for silver I salts that give an insoluble precipitate. Calculate pCl at the equivalence point using the K sp for AgCl to calculate the concentration of Cl —.

In analytical chemistryargentometry is a type of titration involving the silver I ion.