Neutralization Exam Questions

Question A - F

A. What reaction are you picking —→ 2HCL + Mg(OH)2—→ MgCl2 + 2H2O

Neutralization

B. Find The: Reactants & Products by making links to the equation and

observation (experiment) —→ 2HCL + Mg(OH)2—→ MgCl2 + 2H2O

The reactants in the Neutralization Reaction are Hydrochloric Acid and Magnesium Hydroxide, our alkali in this experiment. The products were Magnesium Chloride, a white salt that was formed at the end of the experiment and Water that we tested with Blue Cobalt Chloride paper. It turned from blue to pink indicating the substance was water.

C. Looking back to Answer A, (choosing a reaction), explain WHY you chose it by making links to the equation. —→ 2HCL + Mg(OH)2—→ MgCl2 + 2H2O

I chose this reaction because I know Neutralization is when an Acid, in this case Hydrochloric Acid and an Alkali, Magnesium Hydroxide reacts to form a Salt and Water. In this experiment the salt was Magnesium Chloride.

D. Question 1. Explain how mass is conserved by referring to the reactants and products in the Chemical Equation. —→ 2HCL + Mg(OH)2—→ MgCl2 + 2H2O

Types of Atoms

In the chemical equation, both the products and the reactants have the same atomic makeup. This is because the equation is balanced. No new atoms are created nor destroyed, indicating mass is conserved in the Chemical Equation

D. Question 2. Explain how mass is conserved by referring to the reactants and products in the Chemical Equation. —→ 2HCL + Mg(OH)2—→ MgCl2 + 2H2O

What is occurring to the Atoms

Firstly, the singular Magnesium Atom from the base, magnesium hydroxide breaks away and bonds with the 2 Chloride Atoms from the Hydrochloric Acid, making the Salt, Magnesium Hydroxide. Then the 2 hydrogen atoms from the base and the 2 from the acid come together to bond with the 2 Oxygen atoms for the base, Magnesium Hydroxide. This forms 2 water molecules. Since no new atoms were created no destroyed and all the products simply transformed shape, Conservation of Mass occurred to for the Salt and Water.

D. Question 3. Explain how mass is conserved by referring to the reactants and products in the Chemical Equation.

Calculating Molecular Mass

Both Sides of the Reaction have a molecular mass of 130. (Calculate it). This shows mass is conserved since we can prove no new atoms are created nor destroyed in this equation.

E. In an experiment, equal masses of HCl and MgOH was added. The final Universal Indicator colour was blue. Explain why this occurred and what could be done to get a pH of 7

-UI is blue because CONCENTRATION of OH- ions in the MgOH are greater than H+ ions in the HCl.

-Causes substance to turn blue with UI

-Add more HCl to neutralize the substance

-H+ ions will react with the excess OH- ions making water, a neutral substance

-New pH is 7 and the UI colour will be closer to/green

F. Discuss the “Implication” of excess acid or excess base in our Digestive Systems

Both cause distinct, digestive issues for your stomach

Too Much ACID in the Stomach leads to :

-Heartburn or Acid reflux (GERD), when acidic stomach content gets pushed back up the oesophagus

-Bloating

-Upper Abdominal Pain

Severe Complications Include :

-Gastric Ulcers

-Gastrointestinal Bleeding

Leading to the damage of the stomachs lining

Too Much ALKALI in the Stomach leads to :

-Poor Protein Digestion

-Poor Mineral Absorption into the bloodstream

Severe Complications Include :

-Impairs the stomachs ability to kill bacteria and parasites, leading to Gastrointestinal Infections

This usually occurs because Antacids have been used in excess and instead of neutralizing the extra HCl, it neutralizes your normal stomach acid which should be at a pH at about 1-3.