Using EDTA as a titrant, which brands of milk PEAK, MIkSI, LOYA, COWBELL, NIDO, IDEAL, PEAK TIN, CARNATION, POMO, NUNU and VEGA contain a high concentration of calcium and are economical?
ADDISU YETAGESU ABEBE
Extended Essay
Title: Using EDTA as a titrant, which brands of milk PEAK, MIkSI, LOYA, COWBELL, NIDO,
IDEAL, PEAK TIN, CARNATION, POMO, NUNU and VEGA contain a high concentration of calcium and are economical?
Subject: Chemistry
Name: Addisu Yetagesu
Supervisor: Mr. Kodjo Nkyekyer
Word Count: 3,945 words
Exam Session: May 2011
1
ADDISU YETAGESU ABEBE
Abstract
In this experiment work the research question: Using EDTA as a titrant, which brands of milk
PEAK, MIkSI, LOYA, COWBELL, NIDO, IDEAL, PEAK TIN, CARNATION, POMO, NUNU and
VEGA contain a high concentration of calcium and are economical?, Was investigated.
Calcium is one of the most important alkaline earth metals. It is found in group two and period four in periodic table. Since calcium is used in secretion of hormones and transmitting impulse in our nerve system, it is found in a large abundance in our body. Calcium also found in earth crust in a form of compound like Calcium carbonate. This is because calcium is reactive so it cannot be found as a free element.
To determine the Ca
2+
concentration in different brands of milk, the milk will be titrated with a
known concentration of EDTA solution. The EDTA ion is water soluble so it will react with the Ca
2+
to form a complex. Such titration is known as complexometric titration. The end point of the titration is detected by Eriochrome black T indicator. It shows a colour change from red to blue. To find the moles of the calcium in the milk samples, the mean volume of EDTA that brings the colour change will be multiplied by its concentration. Dividing the mole by the volume of the sample used gives the concentration of the calcium in the solution. Although dividing the cost of the sample by the percentage mass of calcium ion in the sample and multiply it by hundred percent gives the cost of calcium in the solution.
In conclusion the results of the experiment have shown that PEAK
Extended Essay
Title: Using EDTA as a titrant, which brands of milk PEAK, MIkSI, LOYA, COWBELL, NIDO,
IDEAL, PEAK TIN, CARNATION, POMO, NUNU and VEGA contain a high concentration of calcium and are economical?
Subject: Chemistry
Name: Addisu Yetagesu
Supervisor: Mr. Kodjo Nkyekyer
Word Count: 3,945 words
Exam Session: May 2011
1
ADDISU YETAGESU ABEBE
Abstract
In this experiment work the research question: Using EDTA as a titrant, which brands of milk
PEAK, MIkSI, LOYA, COWBELL, NIDO, IDEAL, PEAK TIN, CARNATION, POMO, NUNU and
VEGA contain a high concentration of calcium and are economical?, Was investigated.
Calcium is one of the most important alkaline earth metals. It is found in group two and period four in periodic table. Since calcium is used in secretion of hormones and transmitting impulse in our nerve system, it is found in a large abundance in our body. Calcium also found in earth crust in a form of compound like Calcium carbonate. This is because calcium is reactive so it cannot be found as a free element.
To determine the Ca
2+
concentration in different brands of milk, the milk will be titrated with a
known concentration of EDTA solution. The EDTA ion is water soluble so it will react with the Ca
2+
to form a complex. Such titration is known as complexometric titration. The end point of the titration is detected by Eriochrome black T indicator. It shows a colour change from red to blue. To find the moles of the calcium in the milk samples, the mean volume of EDTA that brings the colour change will be multiplied by its concentration. Dividing the mole by the volume of the sample used gives the concentration of the calcium in the solution. Although dividing the cost of the sample by the percentage mass of calcium ion in the sample and multiply it by hundred percent gives the cost of calcium in the solution.
In conclusion the results of the experiment have shown that PEAK