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Mole Relationships in a Chemical Reaction Chemists can determine the equation for a chemical reaction by identifying the type and amount of the substances involved. The coefficients for the balanced equation can be determined by converting mass values to moles and expressing the mole values in terms of a small whole number ratio.

Chemistry Lab 8:  Mole Relationships in a Chemical Reaction Introduction Chemists can determine the equation for a chemical reaction by identifying the type and amount of the substances involved.  The coefficients for the balanced equation can be determined by converting mass values to moles and expressing the mole values in terms of a small whole number ratio.

In this experiment you will react sodium bicarbonate, NaHCO 3 , with HCl to from NaCl and two gaseous products.  You will determine the mole relationship between NaHCO 3 and NaCl and use this data and the law of conservation of mass-energy to predict a balanced equation for the reaction. Objectives In this experiment, you will:

1. React a known mass of NaHCO 3 with excess HCl;
2. Calculate the mole relationship between NaHCO 3 and the solid product (NaCl);
3. Predict a balanced equation for the reaction;
4. Determine whether your results support the law of conservation of mass energy.

Equipment Evaporating dish scoop Watch glass test tube Dropper pipet beaker Ring stand and ring laboratory burner Wire gauze forceps Procedure

1. Prepare a table for recording your data.  (See Data and Analysis.)
2. Clean an evaporating dish and rinse it with distilled water.  Then heat it to a high temperature to ensure the removal of all moisture. Cool the dish and measure its mass to the nearest 0.01 g.  Use forceps to handle the dish throughout the experiment.
3. With a scoop, add about 3 g of sodium bicarbonate, NaHCO 3 , to the evaporating dish and read the mass to the nearest 0.01 g.
4. Obtain about 6 ml of 6 M hydrochloric acid in a clean test tube and gradually add the acid to the NaHCO 3 with a dropper pipet.  Caution :  HCl causes burns, avoid skin contact .

Source: fay.basd.k12.wi.us

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