Water from a variety of sources that receive precipitation is being sampled. Using a pH meter, the pH of water samples is being measured. In the first approach using titration methods in combination with pH measurement, the volumes of sulfuric acid needed for reaching two different pH levels are being measured. Difference in the volume of sulfuric acid used, is an equivalent for the amount of CaCO3 expressed in grams per (gL-1) in the analyte. Therefore the alkalinity of water samples is being calculated.
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.
In this experiment, the hydrate was separated into water and the anhydrous salt. However, when the masses were combined the overall mass remained constant. In order to find the percent composition, the masses of the water and the anhydrous salt had to be identified. Without these components, it would be impossible to find the percent composition of the water in the hydrate. The empirical formula is the simplest formula of a compound.
Purpose: The purpose of this lab is to investigate whether mass is gained or lost during a chemical reaction. Hypothesis: It will be found out that the mass is neither gained nor lost during a chemical reaction but transferred. Materials: * Safety goggles * Erlenmeyer flask * Balance * Graduated Cylinder * Beaker * Iron (III) chloride solution * Copper (II) sulphate solution * Sodium bicarbonate * Test tubes (small, and large) * Rubber Stopper * Tweezers * Paper towel * Scoopula * Sodium hydroxide solution * Hydrochloric acid Procedure: 1. 5ml of iron (III) chloride was measured and placed in the Erlenmeyer flask. 2.
AP Chemistry P2 Experiment 2: Formula of a Hydrate 9/24/2013 Purpose: Calculate the percent composition of water in a hydrate and determine the empirical formula of the hydrate. Procedure: 1) Set up ring stand with ring clamp, clay triangle, crucible with lid, and burner. Adjust the height of the ring stand. 2) Dehydrating Procedures: 3. Measure approximately 1 g of Copper(II) Sulfate Hydrate into the crucible and crucible and lid.
Therefore, according to Hess’s law, the heat of reaction of the one reaction should be equal to the sum of the heats of reaction for the other two. This concept is sometimes referred to as the additivity of heats of reaction. The primary objective of this experiment is to confirm this law. The reactions we will use in this experiment are: 18 - 1 Computer 18 You will use a Styrofoam cup in a beaker as a calorimeter, as shown in Figure 1. For purposes of this experiment, you may assume that the heat loss to the calorimeter and the surrounding air is negligible.
Observe the color change while it is being heated. After observing the color change, find the mass and moles of the hydrate. Then find the mass and moles of the water eliminated. And lastly find the mole ratio of water to hydrate. For part 2, do the same thing as part 1 except use an unknown hydrate and calculate the percent mass of water in an unknown hydrate.
211, para 2). 3. Construct a hypothesis – Based on your observation in Question 1 and your background research in Question 2, develop a hypothesis statement that addresses the relationship between dissolved oxygen in the water sample and the number of
Reaction Order and Rate Laws Abstract The purpose of the experiment is to determine the rate law for a reaction between hydrochloric acid (HCl) and sodium thiosulfate (Na2S2O3) and once found to calculate the k or specific rate constant of the reaction. To determine the reaction order and rate constant; two experiments with several trials of each will be conducted. First, the concentration of HCl will be changed while the concentration of Na2S2O3 is held constant. Next, the concentration of Na2S2O3 will be varied while the concentration of HCl is held constant. From this experimental data it is found that HCl is zero order in the reaction and Na2S2O3 is first order.
Answer = The dissolved oxygen (DO) is oxygen that is dissolved in water. The oxygen dissolve by diffusion by diffusion from the surrounding air aeration of water that has tumbled over falls and rapids and as waste product of photosynthesis, fish and aquatic animals cannot split oxygen from water (H2O) or other containing compounds. Only green plants and some bacteria can do that through photosynthesis and similar processes. (www.lenntech.com/why_the_oxygen_dissolved_is_important 3. Construct a hypothesis – Based on your observation in question 1 and your background research in question 2, develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of