The purpose of this experiment is to determine the hardness of a sample of water Water hardness can be evaluated by an acid-base neutralization titration. When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. In this titration experiment, there are no definitive acidic or basic agents being evaluated.
Complexometric titrations are titrations that can be used to discover the hardness of water or to discover metal ions in a solution. Ethylenediaminetetraacetic acid, also known as EDTA, is commonly used in complexometric titrations. The students were asked to use the Eriochrome Black T as an indicator and titrate it with 0.
In the course of experiment, the students were able to achieve the objectives of the study.
After standardizing the solution, the average molarity was found to be 4. On sample A, the calcium content was computed as On sample B, the calcium content was found to be The higher the calcium content increases, the degree of hardness also increases.
Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution. An indicator capable of producing an unambiguous color change is Complexometric titration essay used to detect the end-point of the titration.
The titrant used in the experiment is an EDTA solution that is standardized using primary standard[pic 2][pic 3]. EDTA or called ethylenediaminetetraacetic acid is used in this experiment as titrant.
It is an organic agent which has two or more groups capable of complexing with a metal ion is called chelating agent.
Titration with a chelating agent is called a chelometric titration which is a type of complexometric titration. EDTA is a hexadanate ligand that has six pair of unshared electrons capable on complexing with a metal ion, is located on each of the two amino atoms and each of four carboxyl groups.
It contains a sulfonic acid group which is completely dissociated in water and two phenolic groups partially dissociate.
When combined in EDTA its initial color is red and after all the calcium ions have reacted its color changes to clear blue. Moreover, it is used to detect the presence of rare earth metals. Water hardness is a measure of the quantity of divalent ions such as calcium, magnesium and iron in water.
Hardness is traditionally measured by chemical titration. The hardness of a water sample in milligrams per liter as calcium carbonate.
Calcium carbonate hardness is a general term that indicates the total quantity of divalent salts present and does not specifically identify whether calcium, magnesium or some other divalent salt is causing water hardness. Hardness can be a mixture of divalent salts.
Water hardness is used in biological processes of fish. It is used for bone formation, blood clotting and other metabolic reactions.
Fish can absorb calcium for these needs directly from the water or food. The presence of free ionic calcium at relatively high concentrations in culture water helps reduce the loss of other salts like sodium and potassium from fish body fluids like blood.
Sodium and potassium are the most important salts in fish blood and are critical for normal heart, nerve and muscle function. In low calcium water, fish can lose substantial quantities of these salts into the water.
Fish must then use energy supplied by their feed to re-absorb lost salts. That can reduce the energy available for growth and may extend the time necessary to grow fish to market size. For some species environmental calcium is required for good survival. The objectives for this experiment are to let the students learn how to prepare and standardize EDTA solution, and to let them be familiar with the concepts of the complexometric titration and to determine the water hardness using EDTA solution.
Dilute and mix it to mL of volumetric flask. Weigh accurately duplicate 0. To each of the sample, carefully add 5mL of concentrated HCL solution. After dissolution is complete, add about 50mL of EDTA solution, distilled water while rinsing down the sides of the flask in the process.Get Full Essay.
Get access to this section to get all help you need with your essay and educational issues.
Get Access. Quantitative Measurement Of An Analyte In Solution Biology Essay. The titration with a chelating agent is called a Chelometric titration a type of Complexometric titration. EDTA (H?Y) is widely used to find metals in complexometric (a volumetric analysis where the formation of a colored composite is used to bespeak the terminal point of a titration) titrations as it forms stable composites with most metal ions.
The redox reaction is preferable to an acid-base titration because a number of other species in juice can act as acids, but relatively few interfere with the oxidation of ascorbic acid by iodine. This method determines the vitamin C concentration in a solution by a redox titration with potassium iodate in the presence of potassium iodide.
Complexometric titration was used in the experiment since the reaction between the aqueous solutions of the analyte (CaCO3 solution, water sample) and titrant (EDTA) forms a complex. Which involves a coordination center composed of Ca2+ and Mg2+ and the chelating agent EDTA.
A complexometric titration is a technique that uses a colored complex to find the end point of a titration. In this experiment the indicator used was Eriochrome Black T (EBT) at pH When added to a solution containing metal cations, it forms a wine red complex.
Disclaimer: regardbouddhiste.com is an custom paper writing service company that writes custom essay papers, custom dissertation papers, custom term papers, custom thesis papers, custom research papers, project proposals, homework help, assignments, and other custom papers for revision regardbouddhiste.comr, the custom papers may be used when well-referenced.