Zinc and Hydrochloric-Acid Written By Kahlil ZioneDate: 02/02/05 Abstract: We observed the reaction between zinc and hydrochloric acid and recorded it in a table and learned wether the percentage of zinc is effected by the amounts of both substances added to the solution. Introduction The purpose of this experiment is to determine if the amount of zinc and hydrochloric acid will effect the percentage of the zinc in the out coming solution. We are reacting zinc metal with hydrochloric acid to produce a compound of zinc and chlorine atoms. We are then recording our data and observations and place it in a logical data table. Purpose The whole purpose of this experiment is to determine wether or not the amount of the zinc and or hydrochloric acid effects the out coming percent of the solution after under going chemical reaction. Procedure$ 1.
Weigh the zinc metal pieces and place them in a test tube$ 2. Pour some hydrochloric acid over the zinc pieces. Observe$ 3. Allow the zinc d hydrochloric acid to set over night to make sure that the reaction reaches completion. $ 4. Weigh a clean dry evaporating dish.
$ 5. Decant the liquid remaining in your test tube into the evaporating dish. $ 6. Pour 2-3 ml distilled or de-ionized water into test tube and rinse any remaining zinc with water and decant the water into the evaporating dish also.
If you have no remaining zinc pieces, rinse the test tube and decant the liquid into the dish. $ 7. Heat the evaporating dish until there is no more liquid remaining in the dish. The solid remaining will have a puffy and waxy look. Do not overheat but remove from the hot plate and turn off the heat source because the product has a relatively low melting point and it will melt and evaporate away in a white cloud$ 8. When th evaporating dish has cooled sufficiently, weigh the dish with its contents.
$ 9. Clean up by washing and drying your evaporating dish. $ 10. Calculate and report your % zinc in the compound to your teacher for comparison with other lab groups.
Data and Observations I observed that as the chemicals reacted together in the test tube the solution began to create bubbles while the zinc rested at the bottom and then the test tube became hot to the touch from the chemical reaction. Table Conclusion I think that the amount of any substance and its reactant will have a major effect on th e outcome percentage of the solution no matter what chemical it is or wether it zinc or bromine there still is a variable which in this case is amount.