activity to prove conservation of mass
Answers
Answer=
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.
Explanation:
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