The boiling point and melting point can also be used to identify an unknown substance. Date:_________________ Name____Nic munoz ________________ 1. Title: 1pt Liquids and solids 2. Procedure (4pt) (Write the procedure in your own words after you read the manual) 1. B.Pt: I poured rubbing alcohol in a beaker and rubber banded it with the thermometer.
This was done by taking small amounts of the unknown acid. It was then placed into capillary tubes and inserted into the Bibby Sterilin Device. Starting with a high plateau to find a quick melting point and then proceeding to find an actual melting point. The next experiment that aided in finding more characterizations of unknown #2651145-PLF13 was equivalent weight. In order to find the equivalent weight a titration of the unknown acid had to be conducted.
Try to rinse the precipitate in the funnel until the pink color is gone 12. Place funnel in the drier provided until it is completely dry 13. Let cool to room temperature 14. Weigh the funnel and record the weight 15. Subtract the weight of the funnel and the filter paper from this weight to get the weight of the precipitate Results: wt.
First obtain 2 crucibles and lids. Label them #1 and #2. Make sure to clean the crucibles thoroughly. Now for part 1; weigh the crucible without the hydrate before heating. Then weigh the crucible without the hydrate after heating.
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
As aforementioned, the main objective of this lab is to determine whether or not the unknown sample is in fact chromium. In order to do so, the experimenter has a limited list of chemicals to use, which include: * Iron (III) Nitrate, Solid * Chromium (III) Nitrate, Solid * 1.00 M Hydrochloric Acid Solution * 4 M Sodium Hydroxide Solution * Zinc Metal The experimenter also has access to unlimited use of: * Standard lab equipment and glassware * MeasureNet temperature probe * MeasureNet pH probe and drop counter * MeasureNet spectrophotometer and Curvettes In this experiment, the experimenter will utilize various skills learned from previous labs in order to conduct the experiment in a productive and efficient manner. For instance, Chemical reactions will be utilized in order to separate the mixed unknown sample into its various components. One must know that the driving force behind double displacement reactions is the removal of ions, and one must also know that a precipitation reaction is used when two aqueous solutions of ionic compounds are mixed, and a solid is formed. Another example of students using knowledge from a previous experiment is when the experimenter must perform an emission analysis on the remaining aqueous Chromium
First I made a water bath by filling the 100 mL beaker with cool tap water. I then placed crushed ice in the 100 mL beaker so the water level was just below the top of the beaker. I sprinkled a little salt in the ice water and mixed it well. I then filled the test tube half full with distilled water and set the test tube in the 24 well plate. I inserted the digital thermometer into the test tube and took reading every 30 seconds until the readings remained constant.
Note: these formulas would have been written in the upper right hand corner of each box before beginning the lab. 2) Examine your data to see if you can justify eliminating some of the combinations listed as possible precipitates in this experiment. For example, NaCl was an aqueous product in Set 1-15. Therefore it could not precipitate in another box or set. 3) Write equations to indicate what you consider to have happened in each case in which there was precipitate formed.
-Name of the experiment: The study of titration (volumetric analysis) -Purpose: To investigate the titration two standard solutions with opposite pH values and the relationship between pH value and volumes of the reactants. Use this method to determine active ingredients in a commercial basic product. -Task Procedure: Section 1: The making of a standard solution of sodium hydroxide. Section 2: The use of a pH probe and computer program to produce a simple titration curve. Section 3: The titration of an unknown concentration of HCl with the standard solution of NaOH.
Introduction: In Stoichiometry, you can figure out how much product is produced from a chemical reaction by using the starting amount of a substance, while using math. Stoichiometry is the study of the relationships or ratios between two or more substances undergoing a physical or chemical change (Helmenstine). Since all reactions are dependent on how much was started with, we use those numbers to get the product number. In a limiting reactant problem, an amount is given for both the reactants. The smaller amount will ‘limit” how much the reactant can produce.