Similar to the reaction between water and sodium, we observe a strong reaction between the water and potassium metal. Add the potassium metal to the water and observe the reaction. Cut a small amount of potassium metal similar in size to the piece of sodium metal used.ģ. After carrying out the reaction with sodium, prepare a clean Pyrex plate with water and phenolphthalein indicator.Ģ. Ingredients: water, sodium metal, potassium metal, phenolphthalein indicatorġ. Similarities and differences are noted in the reactivity of the two alkali metals. The reaction of potassium with water is compared with the reaction of sodium with water. It can be found dissolved in high concentration in the oceans, and in deposits thousands of feet thick left by the evaporation of ancient seas. The most common form is sodium chloride, otherwise known as table salt. In the Earth's environment, highly reactive sodium is typically found in its ionic state, a positively charged ion, paired with various negatively charged ions in the form of salts. The balanced equation for the chemistry we observe isĢ Na(s) + 2 H 2O(l) → 2 Na +(aq) + 2 OH -(aq) + H 2(g) hydroxide ion! The production of hydroxide ion explains the pink trace. What is the base? Once hydrogen gas is produced from our reaction of sodium and water, the remaining oxygen could be in the form of oxygen gas or. The production of a pink trace in the path of the scooting sodium metal indicates the creation of a basic solution. When the solution becomes basic, the indicator turns pink. Our initially neutral solution of water and phenolphthalein indicator is clear. The gas is observed to be flammable, so it must be molecular hydrogen! We could imagine producing oxygen gas or hydrogen gas. What is the gas? Our reactants are sodium and water. The path of the sodium is marked by a pink trail.Ī gas is produced. Gas evolves from the reaction that occurs at the interface between the sodium and water, causing the sodium to "scoot" around the dish. As the piece of sodium is introduced to the water, the reaction is immediate. Sodium is stored under mineral oil (a complex mixture of hydrocarbons) to prevent it from coming into contact with air or water. Add a small amount of sodium metal to the water and observe the reaction. Add phenolphthalein indicator to the water.ģ. Ingredients: water, sodium metal, phenolphthalein indicatorĢ. Careful observation allows us to determine the reaction's products. The reactivity of alkali metals is explored through the reaction of sodium with water.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |