To perform this experiment, we will utilize emission spectra, titrations, and thermal gravimetric analysis, using knowledge from Experiments 10, 4, Titrations of Na2CO3 and NAHCO3 by HCl (hydrochloric acid) will be performed to determine the concentration of HCl, as well as the number of moles of HCl present within the sample of baking soda. As a result, we will be able to determine the molar concentration of HCl by determining its equivalence point (the point on the graph where the exact amount of rectant needed to perform a reaction has been added) from graphical analysis. Na2CO3(aq.) + HCl(aq.) ==> NaHCO3(aq.)
Adam Workman Lab, Week #1 Balance Lab Introduction The purpose of the Balance Lab experiment was to become familiar with the ChemLab software and to become familiar with different mass measurement methods. During the experiment, three different mass measurement methods were used to determine the mass of copper slugs as well as the mass of two different unknown weights: the direct weight method, the weighing by difference method, and the average mass method using both a centigram balance and an electronic balance. Using the centigram balance, the weight of a single copper slug, in grams, is determined using both the direct weight and weight by difference methods. Likewise, using the electronic balance, the same copper slug is measured by direct weight and weighing by difference methods. Using the same electronic balance, the average mass of five copper slugs, in grams, will be determined.
1) Jeffrey Cox CHE111-DL01 Lab number 10 Stoichiometry of a Precipitation Reaction 2) Purpose/ Intro. In this lab we will be able to calculate the actual, theoretical, and percent yield of the product from a precipitation reaction. We will thusly learn the concepts of solubility and the formation of a precipitate. A precipitate reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of the combined solution as a solid. The solid then is the insoluble compound, called a precipitate.
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
Stoichiometry of a Precipitation Reaction Pre Lab Questions: (2Pts.) 1. What are the learning goals of this experiment? Predict the amount of product produced in a precipitation reaction, accurately measure the reactants and products of the reaction, determine the actual yield vs. theoretical yield, calculate the percent yield. 2.
Jessica Yan Rick St. Denis, Tyler Wiseman 13 September 2012 Projectile Motion: Ball in the Bin Purpose: The purpose of the experiment is to determine the velocity of a ball launched from the Projectile Launcher device, and then to use that velocity to find where on the floor the ball will land given a specific angle. Theory: Two-dimensional motion is as it sounds, made of the two components of Vertical velocity and Horizontal Velocity. Horizontal Motion can be described as constant, neglecting air resistance, and Vertical Motion is characterized by the acceleration of gravity pulling at 9.8m/s². In this particular experiment, the total velocity will be split into the two components in order to find the time in the air, and horizontal distance from the launcher. The motion of these components can be described as d=vt for constant horizontal motion, and d=1/2at² + Vit.
Abstract To determine the coefficient of restitution, the method used will involve recording the height from which a squash ball is dropped and the height with which it bounces up to and then comparing the ratio of the two heights. The temperature will be adjusted by using a water bath heated up to 100°C and then allowing the temperature to fall and recording results as necessary. Using a high definition digital camera to record the height at which the balls bounce against a marked background of 1cm lines. The bounce height recorded by the camera is then divided by the standard initial height of 1.2m to produce e2. This value is then square rooted to provide a value for the coefficient of restitution.
Replace the ramp as in Figure 3.1. Figure 3.1: Equipment Setup Mark with pencil Photogate Use a plumb bob to determine the point directly below where the ball will leave the edge of the table after rolling down the ramp. Measure the distance from the floor to the top of the table at the point where the ball leaves the table and record this value as dy. Ramp Ramp To measure the position where the ball will strike the floor after rolling down the ramp, tape a piece of plain paper onto the floor with a piece of carbon paper on top. The impact ® LED comes ON LED goes OFF Figure 3.2: Measuring Dd 9 Photogate Timers 012-06379A of the ball will leave a clear mark for measuring
Masses are used, as they are easily measurable. The total mass of the system can be calculated using the simple equation Mt=Mb+Mg+Map as it contains all parts of the system Where: Mt=Total Mass of system Mb= Mass of Ball Mg=Mass of Gas Map= Mass of apparatus The Ideal gas law () is then substituted into our unknown, Mg, Giving the equation Mt= Mb+Map+ VMmPRT Where: Mm=Molar mass V=Atmospheric + Ball gas pressure Note that this reveals a graph with a straight can be drawn due to having two unknowns and one constant The atmospheric and ball pressure were both converted in Nm-2 Using the following: 1 psi = 6894.757nm-2 760mmHg = 101325 Pa where 1 Pa = 1Nm-2 For example using our atmospheric pressure of 758.4 psi 758.4760X101325= 101111.6842 Nm-2 And for Gauge pressure valve of 11 psi 11 X 6894.757= 75842.327 Nm-2 Therefore total ball gas pressure = 101111.6842 + 75842.327 =176954.0112 Note that true pressure must be used (atmospheric + Ball gas pressure) and that both that it has been worked out in quantity calculus units in order to make the data easier to read when put into a
Once the angle, or the inclination, is known, we can then calculate the sliding coefficient of friction between the two surfaces. Experimental Description: In this experiment, to determine the coefficients of friction, both static and kinetic, our cart with an aluminum bottom was allowed to slide down an inclined plane. Several choices of covering for the inclined plane were given including aluminum, polyethylene, or left as bare wood. We raised the plane to an angle such that the cart would slightly start moving, then we measured the angle of the plane by using protractor and the sonic ranger to determine the acceleration of the cart (the calibration of sonic ranger – 0.012 percent error).This procedure was performed three times, each with a different inclined plane. Data and Analysis: The coefficient of static friction was derived in the following manner: Coefficient of static friction = (force of friction) / (normal force) Force of friction = horizontal component of gravity = m * g * sin α Force = vertical component of gravity = m * g * cos α Coefficient of static friction = m*g*sin α/ (m * g * cos α) = tan α Coefficient for kinetic friction = [g*m*sin α-(a/m)]/ [g*m* cos α] Where α is