Limiting Reaction Lab Report

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

Aim: The aim of the lab “Chemical Equilibrium” is to observe the effects of changes in concentrations of products and reactants on the position of the equilibrium of given chemical reactions.

The objective of the Get Charged Up lab was to determine the charge on a metal ion reacting with HCl by determine the mole ratio in a reaction by determining the amount of excess reactant, amount of product, and amount of hydrogen gas produced as well as finding the best research method to determine the charge.

In the fourth stage of this experiment, the density of a gas was determined. A 250ml flask was weighed with an empty rubber balloon and the mass was recorded.

Both experiments were able to determine the yield of hydrogen gas by testing the effect of limiting reactants, balanced equations, stoichiometry, mole ratios and molar masses. Balanced equations are equations that have a balanced number of moles of each element on both sides of the equation. Molar mass is the sum of the atomic masses of all elements combined in a chemical substance. Mole rations can be determined using the coefficients of the reactants and products in the balanced equation. Mole ratios can be used to relate moles of product formed from a certain number of moles of a reactant. Stoichiometry is the method of using the relationship between two or more substances in a chemical reaction. The limiting reactant of a chemical reaction is the reactant that is used up first in the reaction and limits how much of the product can be formed. In experiment 2-1, a company wanted to know if magnesium or aluminum would be practical to use as an alternative to zinc to produce a given volume of hydrogen gas. In experiment 2-2, the company wants to know how to optimize the production of hydrogen gas and whether hydrochloric or sulfuric acids are reasonable alternatives for gas production. The The reactions performed in experiment 2-1

The limiting reactant lab was constructed to provide a better understanding of precipitation reactions, by using filtration techniques. Also, it was created to help determine the limiting reactants in a solution, and to calculate theoretical and percent yield. Within the experiment two metal salts were prepared. Part A formed the precipitation of cobalt (II) carbonate, while Part B formed the precipitation of nickel (II) phosphate. The experiment concluded, the calculated theoretical yields of 0.120 g for CoCO3 and 0.184 g for Ni3(PO4)2.

Stoichiometry with Kitchen Chemistry By: Meena Roberts Discussion Section: Wednesday at 8:30 Objective: The purpose of the lab was to see how much carbon dioxide was produced in reaction. Procedure: Measured mass of balloon, mass of NaHCO3 and container, mass of container after NaHCO3 was removed, and mass of NaHCO3 in balloon on digital scale in grams(g).

2. (5 pts) List and explain the names and affiliations of the various characters/stakeholders in this story – I’m looking for us to use the story to map out the complexities that are generally associated with solving public health puzzles – the stakeholders you list and explain here should apply to many of the cases we consider going forward.

The weight of each 50ml beaker (used for weighing the mass of dissolved Potassium chloride after the evaporation of water) should be recorded. If the experimenter were to weigh the mass of one beaker and take it as a default mass, the latter may be a source of error.

At station A when zinc and hydrochloric acid react with each other it is a chemical change because it creates gas bubbles and temperature change. At station B where NaOH solution and phenolphthalein react with each other it is a chemical change because it changed to the colour purple and the change looked difficult to reverse. Station C in which sulfuric acid and magnesium were to react with each other is a chemical change because it formed gas bubbles and changed colour. Station D where hydrochloric acid and Bromothymol blue were the materials is a chemical change because it changed to the colour yellow and looked difficult to reverse. In Station E where NaCl solution and AgNO3 solution were the materials is a chemical change because the reaction

In this experiment, the limiting reactant of all trials was the magnesium while the excess reactant was the hydrochloric acid. This means that, in this reaction, the magnesium is used up completely first, leaving extra hydrochloric acid behind. This was found through stoichiometry, as the reactants were converted into each other through mass-mass calculations. As such, through stoichiometry, it was discovered that magnesium was the limiting reactant as 2.5 grams of magnesium requires 7.5g or 7.5ml (Note: 1g = 1ml) of hydrochloric acid to react. On the other hand, 50g of hydrochloric acid requires approximately 17g of magnesium to react, which is far from the original amount had. Likewise, if 2.5g of magnesium, the largest amount of magnesium

This is done through a change in temperature. Over time, two objects that are in direct contact will

One milliliter of 6.00-M phosphoric acid was placed into a 125-mL Erlenmeyer flask using a volumetric pipette. Using a slightly larger pipette, six milliliters of 3.00-M sodium hydroxide was transferred into a 50-mL beaker. Then a disposable pipette was used to slowly mix the sodium hydroxide into the phosphoric acid while the solution was swirled around. Then both the beaker and flask were rinsed with 2-mL of deionized water and set aside. A clean and dry evaporating dish was weighed with watch glass on a scale. Then the solution was poured into the dish and the watch glass was placed on top. The solution was then heated with a Bunsen burner to allow for the water to boil off to reveal a dry white solid. After the dish cooled to room temperature it was once again weighed and the new mass was recorded.

The purpose of this lab was to test the law of conservation of mass by comparing the total mass of the reactants in a chemical reaction with the total mass of the product.

In a chemical experiment when two substances are reacting, one reactant will be consumed first then the other one and it will be call Limiting reactant. “The limiting reactant is a reactant in a chemical reaction that determines the amount of product produced” (Helmenstine). This is the substance that controls the results, depending on the amount that it can produce it’s going to be determinate how far the chemical reaction can go. The Percent Yield gives the amount of product that could possibly be produced in a given reaction. Percent yield measures how efficient the reaction is under certain conditions.” Percent yield measures how efficient the reaction is under certain conditions” (Boundless). To find the Percent Yield, we have to calculate