chemist crushes a 4.500g sample of the shell to a fine powder and titrates it to the endpoint with 172.mL of 0.380M hydrogen chloride HCl solution. The balanced chemical equation for the reaction is: →+2HClaq CO2−3aq + H2CO3aq 2Cl−aq What kind of reaction is this? Percipitation, acid-base, or redox Calculate the mass percent of CaCO3 in the sample. Be sure your answer has the correct number of significant digits
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
To measure the amount of calcium carbonate CaCO3 in a seashell, an analytical chemist crushes a 4.500g sample of the shell to a fine powder and titrates it to the endpoint with 172.mL of 0.380M hydrogen chloride HCl solution.
The balanced chemical equation for the reaction is:
The amount of sample crushed= 4.500g
Volume of HCl = 172.mL
Molarity of HCl =0.380M
The balanced chemical equation for the reaction between HCl and CO3-2 is
2HCl (aq) + CO3-2(aq) -------> H2CO3(aq) + 2Cl-(aq)
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