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APPLICATION OF COMPLEXOMETRIC TITRATION

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Dara Castro

on 16 March 2016

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Transcript of APPLICATION OF COMPLEXOMETRIC TITRATION

edta application using titatium oxide
preparation
It is obtained from natural samples of ilmenite or from rutile. The ore is heated with conconcentrated sulphuric acid when sulphates of iron and titanium are dissolved in water. The precipitate of titanium dioxide is obtained by hydrolysis.


properties
It is a white or almost white fluffy powder, odorless and tasteless. It is practically insoluble in water and in dilute mineral acids. It dissolves slowly in hot sulphuric acid.

USES
Titanium dioxide is a good topical protective. The protective action is due to opacity of the compound. It protects skin from harmful ultraviolet radiation and hence is commonly employed in skin protective creams, pastes, etc. Due to white color, it is used in cosmetic preparations and also in paints.

ASSAY
It is analyzed by complexometric sodium edetate back titration method. Sample is dissolved in hot sulphuric acid using ammonium sulphate and a definite volume is made. To a known volume, hydrogenperoxide, strong ammonia solution, hexamine buffer and excess disodium EDTA is added and the excess edetate is back titrated with zinc chloride.

storing
It is stored in a well-closed container.

edta application using urine sample
preparation
The procedure consists of precipitation of urinary calcium from an acid aliquot of urine containing an excess of ammonium oxalate, by adjusting the pH to 5.0 using methyl red as the indicator. The urine is then centrifuged and the supernatant is used for the deterinination of magnesium. The precipitate, which is dissolved with hydrochloric acid, is used for the determination of calcium.


properties
Physical characteristics that can be applied to urine include color, turbidity (transparency), smell (odor), pH (acidity - alkalinity) and density. Color: Typically yellow-amber, but varies according to recent diet and the concentration of the urine.

USES
Physical characteristics that can be applied to urine include color, turbidity (transparency), smell (odor), pH (acidity - alkalinity) and density. Color: Typically yellow-amber, but varies according to recent diet and the concentration of the urine.

ASSAY
The method consists of the separation of calcium from magnesium and individual spectrophotometric titrations of each using EDTA as a complexometric reagent and murexide and eriochrome black T as indicators.

STORING
24-hour urine specimens are collected in jars containing about 10 ml. of concentrated hydrochloric acid (concentrated nitric acid is used when a chloride determination is to be performed on the same specimen).

Determination of Cobalt in Paint Driers by EDTA Method
Largest use drier for air dry alkyds and oil paints. Exhibits strong surface drying effects and is usually used in combination with 'through' driers such as lead, calcium or zirconium.

This test method covers a titrimetric determination of cobalt in liquid paint driers that can be dissolved in glacial acetic acid and utilizes the dissodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA).

uses
The amount of Cobalt drier used in oxidizing-type coatings significantly affects their drying properties. This test method may be used to confirm the stated cobalt content of a pure liquid cobalt drier soluble in glacial acetic acid and manufactured for use by the coatings industry.

standardization
EDTA, Standard Solution (0.05M)- weigh to the nearest 0.1 mg approximately 1.5 g of ZnO into a 100-ml beaker and add 10 ml of H2SO4 (8+1). Transfer the solution to a 500-ml volumetric flask and dilute to the mark with water. Pipet a 50-ml aliquot into a 500-ml erlenmeyer flask, add 100 ml of water, 2-3 drops of methyl-red indicator solution, and neutralize with NaOH solution (80g/L). Add 5 ml of buffer solution, 0.2 g of Eriochtome Black-T inficator, and titrate with EDTA solution until the color changes from red to blue, where the last red shade just disappears.
CuSO4, Standard Solution (0.05M)- Determine the titer of CuSO4 solution by titrating 50ml of the standard EDTA solution with CuSO4 using PAN indicator solution

procedure
Check the clarity of the drier. If not clear centrifuge a portion of the sample until it is clear. Keep the centrifuge tube stpered so that solvent will not evaporate.
Weigh the following specimen amounts into a 500-ml Erlenmeyer flask and add 5 ml of glacial acetic acid: for 6% cobalt, 1.0 to 1.3 g, for 8%, 0.8 to 1.0 g, and for more or less cobalt use proportionate specimen sizes. Warm on a hot plate at low heat, swirling the flask until the specimen is completely dissolved.
In a second flask (blank) put the same amount of glacial acetic acid but no sample. Add 200 ml of isoprophyl alcohol, 100 ml of water, 6ml of concentrated NH4OH, 10 ml of NaC2H3O2 solution and 50 ml EDTA solution to each flask. Swirl to ensure complete mixing and warm both flask at steam bath temperature for 5 mins.
To each of the flasks add 2 ml of PAN indicator solution and titrate with standard CuSO4 solution to a blue end point.

properties
Volatile Organic Compounds: (VOCs) .90 lbs/gallon
Boiling range: > 590-725
Vapor Density vs Air: Heavier
Density: 7.70 lbs./gallon ASTM D1475
Type of Odor: Oily hydrocarbon
Appearance: Purple liquid
Evaporation Rate vs Butyl Acetate: Slower
Percentage volatile by Weight: 55% ASTM D2369
Vapor pressure: less than 0.04 psi
Specific gravity: 0.92
Odor Threshold: High

storing
Avoid storing above 90°F. Keep closed when not in use.

Determination of Magnesium in Fertilizers with the Use of EDTA Titration Method
Significance and uses
Magnesium is an essential plant nutrient. It has a wide range of key roles in many plant functions. One of the magnesium's well-known roles is in the photosynthesis process, as it is a building block of the Chlorophyll, which makes leaves appear green.
 Magnesium deficiency might be a significant limiting factor in crop production.
Magnesium amounts that the plant can take up depend on its concentration in the soil solution and on the capacity of the soil to replenish the soil solution with magnesium.

Standardization
Pipet 10 mL of Calcium Standard solution into 300 mL Erlenmeyer flask. Add 100 mL of water, 10 mL of KOH-KCN solution, 2 drops of triethanolamine solution, 5 drops K4Fe(CN)6 solution, and 15 mg calcein indicator. Immediately place flask on magnetic stirrer in front of daylight fluorescent light and white background. While stirring, titrate with EDTA solution to disappearance of all fluorescent green and until solution remaind pink.

Preparation of Solution
Organic Materials
- weigh 1g sample of 250 mL boiling flask or Erlenmeyer. Add 5 mL HCl and 10 mL HNO3 then boil on hot plate or over low flame until easily oxidized organic matter is destroyed, but no to dryness. Cool and transfer to 250 mL beaker with 100 mL H20.
Inorganic Materials
- weigh 1g sample of 250 mL boiling flask or Erlenmeyer. Add 5 mL HCl and 10 mL HNO3 Cover with watch glass and heat on asbestos mat on how plate nearly to dryness. If solution remained colored from organic residues, add 5 mL HClO4 and continue heating to copius fumes.

Properties
Density: 0.67 g/cm3
Solubility: 720 g/ 1 liter water
EC(Vltsu) : 1.0-1.2 
Mixability: Does not mix with phosphorus containing fertilizers
Humidity absorption: High
Storage life: in sealed packages, indefinitely
determination of calcium in liming materials using edta titrimetric method
Significance and uses
The most common material used for liming soils is ground limestone. Limestones range from pure calcium carbonate to mixtures of calcium carbonate and calcium-magnesium carbonate (dolomitic limestone).
standardization
Pipet 10 mL standard Calcium solution into 300 mL erlenmeyer and add 10 mL H 2 0. Add 10 mL KOH-KCN solution and Calcium 35 mg calcein indicator. Using mag. stirrer and artificial light, titrate with 0.4% EDTA stadard solution to disappearance of all green.
preparation of sample
Dry sample at 110° to constant weight and cool to room temp. Grind to pass No. 60 or 80 sieve and mix thoroughly. Accurately weigh Calcium 0.5 g into 250 mL beaker, add 20 mL HCI (1+1), and evap. to dryness on hot plate. Dissolve residue in 5 mL HCI (1 + 10), dil. to ca 100 mL with H 2 0, and digest over low flame 1 hr. Cool, transfer to 200 mL vol. flask, dil. to vol., mix, and let settle or filter.
Pipet 10 mL aliquot into 300 mL erlenmeyer and titrate as in 1.023(a), observing end point through solution and away from light. % Ca - (Titer EDTA standard solution for Ca) x mL EDTA standard solutionn x 2/g sample.
properties
Chemical Formula : CaCO3
Molar mass: 100.0869 g/mol
Appearance: Fine white powder;chalky taste
Odor: odorless
Density: 2.711 g/cm3 (calcite)
: 2.83 g/cm3 (aragonite)
Melting point: 1,339 °C (2,442 °F; 1,612 K) (calcite)
825 °C (1517 °F; 1,098 K) (aragonite) 
Boiling point: decomposes
Solubility in water: 0.013 g/L (25°C)
Solubility product (ksp) : 3.3×10−9(4)
Solubility in dilute acids: soluble
Acidity (pKa): 9.0
Refractive index: 1.59
Tetrasodium EDTA in soap Avoid of Dreaded orange spots (DOS) in Soap Using Tetrasodium EDTA
Causes of the DOS in the Soap
a.) Too much superfatting
b.) Rancid Oil used
c.) Short shelf life of oil
d.) "Soft" oils (olive, canola, sunflower, e.g.)e.) High temperature curing


significance and uses
Disodium EDTA (Ethylenediaminetetraacetic acid) is a white granular powder commonly used in cosmetics that are ph neutral to mildly acidic. It is used as a preservative ENHANCER, stabilizer and purifying agent to keep formulas free of contamination from tap water. It also helps with topical penetration of ingredients when formulated into skincare products. In laundry and cleaning solutions, disodium EDTA softens hard water and improves the bleaching and cleansing performance of non-chlorine cleansers.  

EDTA (ethylenediamine tetraacetate) offers two benefits when used in soap. It increases the shelf life of your soap by chelating (binding up) certain metals that can cause DOS (dreaded orange spots, also known as rancidity). EDTA also reduces the amount of sticky soap scum formed when lye soap is used in hard water.
EDTA and citrate do similar jobs, so if one does not appeal, then consider using the other. EDTA is arguably not as "crunchy" as citrate, so it is not the best choice for a "natural" soap. Both will function well to increase shelf life, but I suspect EDTA may be somewhat more effective than citrate in reducing soap scum and preventing rancidity.

Kinds of edta uses and properties
There are two basic kinds of EDTA available to home crafters, so be sure to buy the correct type. TETRAsodium EDTA should be used in soap and other alkaline products. This is the type of EDTA that I am talking about in this article. DIsodium EDTA is the other kind of EDTA; it should only be used in neutral pH to slightly acidic products.
Tetrasodium EDTA is available in two forms: powder that is about 85% pure EDTA and liquid that is usually a solution of 39% EDTA in water. Either form can be used. My dosage suggestions are based on the powder form.



preparation
Option A:
1. Dissolve EDTA in distilled water with Sodium Chloride (Salt).
2. Add during light trace.

OPTION B: (AFTER LYE SOLUTION)
1. Dissolve EDTA in lye water.

OPTION C:(BEFORE LYE SOLUTION)
1. Dissolve EDTA in Distilled water before adding lye.

Typical dosage for bar (NaOH) soap or liquid (KOH) soap is 0.5% of EDTA powder based on total batch weight.
That is 5 g EDTA per 1000 g of total batch weight. Total batch weight is the sum of the oil weight + water weight +
lye weight.
Dosage range is 0.05% to 4% of EDTA powder based on total batch weight.
This dosage range, based on a number of sources, is really wide, so here are some tips to help you decide what amount to use:
Dosages from 0.05% to 0.25% (0.5 g to 2.5 g EDTA per 1000 g total batch weight) are suggested for preventing
DOS and thus increasing the shelf life of soap, with dosages
from 0.1% to 0.15% (1 g to 1.5 g EDTA per 1000 g batch weight) being common recommendations.
recommends using 0.5 g EDTA per 1000 g oils to effectively control DOS. (Note his use of oil weight, not total
batch weight.)
A blend of 1.0 g rosemary oleoresin (ROE) plus 0.5 g EDTA powder added per 1000 g oils may be more effective at preventing
DOS than either EDTA or ROE alone.
Slightly higher dosages seem to be needed to also combat hard water scum.
One source suggests using up to 4% for this purpose, but that dosage seems unusually high.
Informal feedback from handcrafted soapers show 0.25% to 0.5% (2.5 g to 5 g per 1000 g batch weight) works well
to effectively reduce soap scum as well as lengthen shelf life. Use the lower percentage for soft water. Use the higher amount for
hard water or If you are not sure about the hardness of the water.
If using an EDTA solution, blend it into your fats, add the lye solution, and soap as usual.
If using EDTA powder, mix the powder into a small portion of the water in your recipe until the powder is dissolved and
blend this mixture into your fats. I do not recommend adding EDTA to your lye solution -- the EDTA will react with the lye to form a
white pudding-like mixture that is difficult to work with.


assay

The process is consist of dissolving tetrasodium EDTA with other ingredients of soap. Tetrasodium EDTA will act as a chelating agent in the soap.

Application of Complexometric
titration

Members:
Castro, Ingrid Dara
Cudilla, Terrence
Daraman, Eldren
Delos Reyes, Kin
Herras, Joshua
Melo, Cassandra Aurora
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