A Carbonate Analysis; Molar Volume of Carbon Dioxide, Slides of Chemistry

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Exp 4.

A Carbonate Analysis;

Molar Volume of Carbon

Dioxide

Experimental Procedure

Online Class

▪ Objectives ▪ Introduction ▪ Experimental Procedure & Result Videos ▪ Report Sheet ▪ Evaluation Criteria Content

Introduction Calcium carbonate Calcium carbonate readily reacts in an acidic medium to produce CO 2 gas. CaCO 3

( s) + 2 H

3

O

( aq) → Ca

2+

( aq) + 3 H

2

O( l) + CO

2

( g)

Boyle’s & Charles’ law and Ideal gas law Reference: slideshare.net

Dalton’s law

For a mixture of gases in a container,

P

total

=P

1

+P

2

+P

3 Reference : Khan academy.org

Experimental Procedure & Result Videos

PART A. Sample Preparation and Setup of Apparatus

• Trial

2. Sample preparation

a. Mass of heterogeneous sample

• Calculate the mass of CaCO 3 that would produce ̴ 40 mL of CO 2 at STP. Show the calculation on the

Report Sheet.

• Measure this calculated mass of the sample mixture (unknown sample), one that contains CaCO 3 and a noncarbonate impurity.

b. Set up the CO 2 generator Place 10 mL of 3 M HCl in a 200 - mm test tube; carefully slide the 75 - mm test tube into the 200 - mm test tube

without splashing any of acid into the sample. IMPORTANT:

The HCl ( aq) is in the 200 - mm test tube and separately,

but inserted, the CaCO 3 (s) sample is in the 75 - mm test tube. Do not mix the two substances until PART B. 1!

3. Setup of CO 2 collection apparatus

a. Saturated water with CO

2

b. Fill CO

2

(g)-collecting graduated cylinder

• Use the CO 2 saturated water in the dish to fill the 50 - mL graduated cylinder that will collect the CO 2 from the sample.
• Fill the graduated cylinder by laying it horizontal in the water, and then, without removing the mouth of the cylinder from the water, set it upright.

c. Connect the gas inlet tube ▪ Place the gas inlet that connects to the CO 2 generator into the mouth of the 50 - mL CO 2 (g) collecting graduated cylinder. ▪ Support the graduated cylinder with a ring stand and clamp. ▪ Read and record the water level in the graduated cylinder (if no air entered the cylinder, it should read zero).