Brandon Landry
Partner: Krista carrier, Phoebe balase, and Justin kinsman
Chemistry 112-C Stephen DeVries
May 30, 2013
Background Information
A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products. A single replacement reaction is a chemical change in which one element replaces a seconded element in a compound. A double replacement, which is a chemical exchange of positive ions between two compounds.
Mg(OH)₂ + H₂SO₄→ MgSO₄ + 2H₂O
Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
CuSO₄ + Zn → ZnSO₄ + Cu
CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl
CoCl₂ + 2NaOH → 2NaCl + Co(OH)₂
NaC₂H₃O₂ + HCl → HC₂H₃O₂ + NaCl
2Mg + 2HCl → 2MgCl + H₂
CuCO₃ → CuO + CO₂
Problem
What reaction products result when the following substances are mixed?
Aqueous solutions of Magnesium Hydroxide and Sulfuric acid are mixed.
Solutions of Lead (II) Nitrate and Potassium Iodide are mixed.
A clean Zinc strip is placed in a Copper (II) Sulfate solution.
Solutions of Calcium Chloride and Sodium Carbonate are mixed.
Solutions of Cobalt (II) Chloride and Sodium Hydroxide are mixed.
Hydrochloric acid is added to a Sodium Acetate solution.
Magnesium turnings are placed in Hydrochloric acid.
Weigh an empty evaporating dish. Record. Weigh the evaporating dish plus about 3.00g of Copper (II) Carbonate. Record. Heat the Copper (II) Carbonate on the hot plate until the reaction stops. When the evaporating dish cools, reweigh the evaporating dish and its contents. Record. If Copper (II) Carbonate decomposes to Copper (II) Oxide and Carbon Dioxide, calculate the amount of Carbon Dioxide that should be given off. Record.
Hypothesis
Well if I mix aqueous solutions of magnesium hydroxide and sulfuric acid then it will form a chemical change of color and possibly a change in odor and temperature and a double replacement reaction.
Well if I mix lead (II) nitrate and potassium iodide, then it will form a chemical change of color discoloration and a double replacement may occur.
Well if I mix copper(II) sulfate with a zinc strip, then a chemical change may occur and a change in color and odor may occur around the zinc a single replacement may occur.
Well if I mix calcium chloride and sodium carbonate, then there will be no reaction will occur and there will be a double replacement reaction will occur.
Well if I mix cobalt (II) chloride and sodium hydroxide, then a chemical reaction of some precipitation or some bubbling may occur and a double replacement reaction may occur.
Well if I mix hydrochloric acid to a sodium acetate solution then it will form a chemical reaction of some color change, or possibly some distinct change in odor and a double replacement reaction will occur.
Well if I mix magnesium and hydrochloric acid, then it will form a chemical reaction of discoloration and possibly some rusting, possibly bubbling, and a single replacement reaction may occur.
Well if I mix copper (II) carbonate to a evaporating dish on a hot plate then it will form a chemical reaction of possibly evaporation and blackening and a combustion reaction may occur.
Procedure
Perform each reaction indicated in the problem.
Record observations before, during, and after the reaction.
Clean all apparatus and the lab bench before leaving the lab.
Observations
Experiment 1-
Before
Aqueous solutions of magnesium hydroxide- no smell, clear, liquid, and warm temperature. Sulfuric acid- pungent odor, clear, liquid, and warm temperature.
During A change has occurred, no smell, also still a liquid, also cold. Temperature changed to cold.
After Still no changes have occurred.
Experiment 2-
Before
Lead (II) nitrate- no smell, temperature cold, liquid, and clear. Potassium iodide – no smell, clear, liquid, and cold.
