# Limiting Reactants Lab Report

Superior Essays
The purpose of the experiment was to observe limiting reactants by using a fixed amount of one reagent along with a varying the amount of the second reagent used in a chemical reaction. Through these results, the concept of limiting reactants can be determined. Using a graph to demonstrate the relation between the volumes of hydrogen gas produced versus the moles of the reagents will help figure out the stoichiometric balance required. The success of the experiment will be determined by the comparing the experimental values with the fixed values.

Introduction
Stoichiometry involves converting chemical formulas and equations that represent individual atoms, molecules, and formula units to the laboratory scale that uses milligrams, grams, and kilograms, of these substances (1). A limiting reactant is the reactant that has been completely consumed in a chemical reaction. It is
A graph of the volume of hydrogen gas produced versus moles of a reagent that is varied will be able to tell you the point in which the stoichiometric balance is achieved and what the limiting reactant is. In this experiment group A used a constant mass of magnesium metal (0.100 g) and varying volumes of 2.00 M hydrochloric acid added from 2.00 mL to 7.00 mL in progressions of 1.00 mL which in total came out to be six distinctive chemical reactions. Group B used the consistent volume of 2.00 M hydrochloric acid (5.00 mL) and changed the mass of the magnesium metal used from 0.070 g to 0.170 g in growths of 0.020 g which resulted in a total of six different chemical reactions as well. The percent yield for magnesium, according to the data, was 107.3% and the percent yield for hydrochloric acid, according to the data, was 96.0%. Overall, the experiment was fairly successful as observed by the percent yields of both

## Related Documents

• Improved Essays

This lab makes use of the reaction excess powdered calcium carbonate and different concentrations limiting hydrochloric acid in order to determine the effect of changing concentration on the rate of the reaction. Students will carry out 3 trials of 5 experiments each trial. The five different experiments are for the various concentrations of hydrochloric acid (0.2, 0.4, 0.6, 0.8, 1.0 mol/L). First measure out approximately 2 grams of powdered calcium carbonate using a weighing boat and analytical balance. Then, measure out 30 mL of 0.2 M hydrochloric acid into a volumetric flask.…

• 198 Words
• 1 Pages
Improved Essays
• Improved Essays

Reduction involves increasing the number of carbon hydrogen bonds by adding hydrogen across a double or triple bond which results in an increase in electron density at the carbon atom. Organic functional groups containing double and triple bonds which undergo reduction are unsaturated. The reduction of the double bond by addition of hydrogen atoms results in the product being fully saturated. Metal hydride reducing agents that have different reactivities toward specific functional groups are commonly used in chemical reductions.…

• 1277 Words
• 6 Pages
Improved Essays
• Improved Essays

“Classifying Chemical Reactions - Lab Report” I - Introduction - Chemistry is the study of the composition, structure, properties and change of matter. In chemistry, chemical and physical changes are used to help scientists understand how different substances react given various circumstances. A chemical change is any change resulting in the formation of a new chemical substance(s). A physical property is any change that does not involve the chemical makeup of a substance at all. In total there are five (5) chemical reactions.…

• 1370 Words
• 6 Pages
Improved Essays
• Great Essays

Purpose: The purpose of our experiment was to precipitate Copper (II) Phosphate Trihydrate and determine percent yield, also to react an aqueous solution of Copper (II) Chloride with aqueous Sodium Phosphate and describe the reaction. Procedure: To conduct our experiment 10 milliliters of CuCL2 and 8 milliliters NaPO4 was added to its own 50 milliliter beaker. These solutions were then combined in a 150 milliliter beaker and mixed for 1 minute. The PH of the mixed solution was checked to see if it was accurate enough to go on with the experiment. The solution was then filtered using the vacuum filtration technique.…

• 779 Words
• 4 Pages
Great Essays
• Improved Essays

The aim of this experiment was to determine the percentage composition of magnesium and oxygen in magnesium oxide and evaluate if the composition varies or remains constant. To test this, magnesium was heated and made to react with the oxygen gas in the atmosphere. This reaction formed the ionic compound, magnesium oxide. The percentage composition was later calculated based on the results of the experiment as shown in the above calculations, Figure 4. These results were compared to the expected percentage composition also calculated in calculations, Figure 1.…

• 917 Words
• 4 Pages
Improved Essays
• Improved Essays

All of theses reactions was needed in ordered to be prepared for the lab experiment. Before the lab began it was necessary to follow the lab safety rules by wearing a lab coat, googles, and gloves. There were nine unknown chemicals in nine plastic droppers labeled from one to nine sitting at the label tables. There were nine clean test tubes that were provided in order to mix the chemicals together. 10 drops of each unknown chemical was added when being mixed in test tube to perform a reaction.…

• 791 Words
• 4 Pages
Improved Essays
• Decent Essays

The objective of this lab was to identify the limiting reactant, which the lab's data showed the limiting reactant to be Beaker A. According to the Limiting Reactant Document, it states "limiting reactants control the amount of product possible for a process because once the limiting reactant has been consumed, no further reaction can occur"(2nd paragraph). The mole of Beaker A was .00500 of CuCl2 as Beaker B's was .0056 mol of CuCl2. During the lab, Beaker A's solution had a larger amount of aluminum foil pieces than Beaker B's solution; showing that the limiting reaction has to have a smaller volume. In the Limiting Reactant Document, based on their second experiment, " Substance A and B react in a 1:1 ration, and with only 0.5 mol of Substance…

• 177 Words
• 1 Pages
Decent Essays
• Improved Essays

1. The reported mole ratio of magnesium to oxygen will be too high. The experiment will have less oxidation while burning. Since there are 2 oxygen and some of the magnesium evaporates as it burns, the ratio will be higher than usual 2.…

• 297 Words
• 2 Pages
Improved Essays
• Improved Essays

This could also lead to evolution, survival of the fittest, overpopulation and the extinction of others. Limiting factors can be many things like space, food, light and many other things. For Sunflowers and example that would lead to carrying capacity would be if all the organisms that consumed or killed the plant would be removed from its environment by an invasive species or environmental changes, then the Sunflowers would grow faster and closer to each other. This would cause space, water, and sunlight to become a limiting factor. Helianthus need lots of space for their long roots to receive water.…

• 909 Words
• 4 Pages
Improved Essays
• Improved Essays

Experiment 4: Kinetics of Nucleophilic Substitutions 1. Determine the effect of varying [OH-] on the rate of the reaction. To do this, you should complete the following table: Experiment [tBuCl]0 (M) [OH-]0 (M ) Time (s) Reaction rate (M/s) Rate constant (s-1) 1 0.03 0.003 65 4.89 · 10-5 1.62 · 10-3 2 0.03 0.006 213 3.15 · 10-5 1.05 · 10-3 3 0.03 0.009 362 2.96 · 10-5 9.85 · 10-4 What is the dependence of [OH-] on the rate law? The effect of the increased or decreased [OH-] on the rate law is very minimal.…

• 1172 Words
• 5 Pages
Improved Essays
• Great Essays

When comparing the same substance under different conditions, the combined gas law can be mathematically written as (P"1" V"1" )/T"1" = (P"2" V"2" )/T"2" . Since the conditions of the experiment were not at standard temperature and pressure, the combined gas law is required in order to calculate the corresponding volume of hydrogen gas at STP. Single displacement reactions were also…

• 1741 Words
• 7 Pages
Great Essays
• Superior Essays

Throughout each test, manganese dioxide had a higher reaction rate than the potato. In data table two, the new potato piece and new H₂O₂ had a reaction rate of 2.5 out of 3 and the manganese and new H₂O₂ had a reaction rate of 3. Additionally, the 1 mashed potato piece had a reaction rate of 2 out of 5 and 1 scoop of manganese dioxide had a reaction rate of 3. Two mashed potato pieces had a reaction rate of 4 and 2 scoops of manganese dioxide had a reaction rate of 5. Three mashed potatoes had a reaction rate of 4.5, and 3 scoops of manganese dioxide had a reaction rate of 5.…

• 1820 Words
• 8 Pages
Superior Essays
• Improved Essays

The heat capacity of the calorimeter was determined to be 19.3 J/˚C. For reaction 1, which was between NaOH and HCl, the enthalpy of the reaction was -45.7 kJ/mol. For reaction 2, which was between NaOH and NH_4 Cl, the enthalpy of the reaction was -8.67 kJ/mol. For reaction 3, which was between HCl and NH_3, the enthalpy of the reaction was -46.2 kJ/mol. The enthalpy of reaction 3 determined by Hess’s Law and the results of reactions 1 and 2 was -37 kJ/mol.…

• 840 Words
• 4 Pages
Improved Essays
• Decent Essays

These can also be used to find the limiting reactant. A limiting reactant is the reactant that is used up and limits the amount of products formed. The other kind of reactant is the excess reactant, which is the reactant that is left over and not used up fully. To determine which reactant is which, the chemical equation must be balanced.…

• 289 Words
• 2 Pages
Decent Essays
• Improved Essays

The coefficients in a balanced chemical equation represent moles of reactants and moles of products. The mole ratio of reactants and products in a balanced equation must remain constant. Stoichiometry relates to cookies because all the ingredients mixed together make the cookies. In the process of mixing elements in during chemical reactions the precision of measures of…

• 548 Words
• 3 Pages
Improved Essays