Question

give a suitable experiment to illustrate the law of conversation of mass​

Answer 1

Answer:

Law of Conservation of Mass - Experiment to illustrate the law of conservation of mass-

The experiment will explore whether matter is created or destroyed during a chemical reaction.

Materials Substitutions

solutions of NaOH, CuSO4, NH4OH, and Na2CO3 solutions made with Drano, Bluestone algaecide, ammonia, and washing soda

4 graduated cylinders 4-2 oz plastic cups

3 150-mL beakers 3-5 oz plastic cups

balance

Procedure

1. Label the four graduated cylinders (or 2 oz cups) to contain the solutions (one each for NaOH, CuSO4, NH3 (aq), and Na2CO3).

2. Use a graduated cylinder to measure about 60 mL (2 oz) of the NaOH solution. Use a second graduated cylinder to measure about 60 mL (2 oz) of the CuSO4 solution and pour it into a 150-mL beaker (or 5 oz cup).

3. Carefully place the two solutions (in their containers) on the balance. Weigh the solutions and their containers together and record their combined weight.

4. Pour the NaOH solution into the container with the CuSO4 solution. Allow the solutions to mix. Describe what happens.

5. Weigh both containers and the mixture again. Record the new weight.

Did the weight change?

6. Repeat the process in steps # 2 and #3 above, first substituting NH3 (aq.) for the NaOH solution, then substituting Na2CO3 for the NaOH solution. In each case measure and record the masses as described in steps #3 and #5 above.

Data and Observations

1. Total weight of NaOH and CuSO4: Before __________g After _______g

2. Total weight of NH3 (aq) and CuSO4: Before __________g After _______g

3. Total weight of Na2CO3 and CuSO4: Before __________g After _______g

Complete the following equations:

4. NaOH + CuSO4 —–>_________________________________

5. NH3 (aq)+ CuSO4 ——->_____________________________

6. Na2CO3 + CuSO4 ——->____________________________

Extensions

The substances chosen for this lab are common and easy to find. You may want to repeat this lab with solutions of Fe(NO3)2 or Zn(NO3)2 solutions with Na2CO3. or NaOH. Note that NEITHER iron(II) or zinc carbonates or hydroxides are as insoluble as the copper(II) analog. While barium and lead salts have frequently been used in this type experiment, the problems associated with disposing of these materials suggests NOT USING either of these salts in experiments.