Chem Lab Report

In: Computers and Technology

Submitted By sarasaraf
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INTRODUCTION Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks in all parts of the world, and is the main component of shells of marine organisms, snails, coal balls, pearls, and eggshells. Calcium carbonate is the active ingredient in agricultural lime, and is created when Ca ions in hard water react with carbonate ions creating lime scale. It is commonly used medicinally as a calcium supplement or as an antacid, but excessive consumption can be hazardous. To avoid the breakage of eggs before reaching market, the eggshells needs to be as strong as possible. The strength of eggshells is mainly determined by the percentage of calcium carbonate in it. In order to monitor the quality of eggshells, the following experiment has to be done to determine the percentage of calcium carbonate in eggshells. In this experiment, back titration is used. The purpose of this experiment is to determine the percentage by mass of calcium carbonate in eggshells.

OBJECTIVES To determine the calcium carbonate content in an eggshell. MATERIALS AND APPARATUS Pipet, buret, Erlenmeyer flask, graduated cylinder, hot plate.
Reagents: Hydrochloric acid, sodium hydroxide and phenolphthalein.

PROCEDURE The weighed eggshell was placed into a beaker and 30mL of previously standardized HCl was added into it. The mixture was warmed for 25 minutes using hot plate until all the bubbles was…...

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