25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl → 2NaCl + CO2 + H2O 6. 25 cm3 of a sample of vinegar (CH3COOH) was pipetted into a volumetric flask and the volume was made up to 250 cm3. This solution was placed in a burette and 13.9 cm3 were required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Calculate the molarity of the original vinegar solution and its concentration in gdm-3, given that it reacts with NaOH in a 1:1 ratio.
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.
5.04H: Gas Stoichiometry Lab Worksheet Name: _________________________ Data and Observations: Present all relevant data in a data table below. Include an observations section for any observations that you made during the lab. (5 points) Data Table| Mass of magnesium strip (grams)|0.0304g| Volume of gas collected (mL)|10ml| Barometric pressure (atm)|1.1| Room Temperature (°C)|21 | Vapor pressure of the water (torr)|18.7| Calculations: 1. Write the balanced equation for the reaction conducted in this lab, including appropriate phase symbols. (2 points) Mg(s) + 2 HCl(aq) → H2(g) + MgCl2(aq) 2.
Calculate the volume of 0.250 M H2SO4 that contains 0.250 g H2SO4. 0.250 g H2SO4 x 1 mole x 1 L = 0.0102 L 98.12 g 0.250 mole 5. 1.50 g of NaCl is dissolved in 100.0 mL of water. Calculate the concentration. 6.
* Stirring * Temperature * Time * Amount/Type of solute * Amount/Type of solventAsk ch to put hands up and to call out ideas of factors which may influence dissolving and write them on the board. Tell ch that today we are going to focus on TEMPERATURE.Teacher will guide Ch to discuss in talk partners WHY and HOW they think TEMPERATURE may affect sugar from dissolving and then to feed ideas back to teacher and rest of ch.Ch to make predictions about what will happen to the sugars rate of dissolving in each temperature | The teacher will introduce the lesson by discussing with the ch about what they already know about dissolving. * What do the children already know * Any misconceptions * Any new ideas to be discussed * Teacher to make sure that temperature is discussed to obtain any misconceptions about temperature. The teacher will provide ch with post it notes to write down factors which they think may affect dissolving of sugar – make sure temperature is included. Teacher to write these ideas on the board.
Experiment 1: Observations of Chemical Changes Name: Matthew Neely Date of Experiment: 06-25-14 Location: My apartment Course Number: CHE112 Abstract: In this experiment the objective was to observe the macroscopic properties of chemical reactions and to associate these reactions with household products. With the mixing of the provided chemicals we will learn to interpret microscopic changes in terms of the behavior of atoms and molecules (Lab Manuel, pg.14). Experiment and Observations: To begin the experiment I obtained the 96-well plate to place each instructed combination of chemical in. Also needed for the experiment was a dark and light piece of paper to place behind the 96-well plate during the observation period of each reaction. Once the chemicals had been organized I then place 2 drops of the first chemical and 2 drops of the second chemical into the allotted well.
6. Write the equilibrium constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298K, using data in your Appendix B. a) NaHCO3 (s) [pic] NaOH (s) + CO2 (g) b) 2 HBr (g) + Cl2 (g) [pic] 2 HCl (g) + Br2 (g) c) 2 SO2 (g) + O2 (g) [pic] 2 SO3
Curriculum Outcomes C11-4-04 Explain heat of solution with reference to specific applications. Examples: cold packs, hot packs. C11-3-05 Write and classify balanced chemical equations from written descriptions of
It is concluded that these are the three ingredients in a tablet of Excedrin. By using the line equation and the calculations represented in appendix A, this is how much of each ingredient is in an Excedrin tablet. References: 1. Williamson, Kenneth L., and Katherine M. Masters. Macroscale and Microscale Organic Experiments.
Acid-Base Titrations Chemistry Quick Review of an Acid-Base Titration Calculation By Anne Marie Helmenstine, Ph.D., About.com Guide See More About: * titration * calculations * study sheets * acid-base reactions Ads Analytical InstrumentsGC, HPLC, LCMS, Microplate Readers Refurbished Laboratory Instrumentswww.conquerscientific.com Chemistry course in ukGet a Degree in Chemistry from a UK University. Free expert advice.www.click-courses.com/Chemistry Litmus paperRed, blue and neutral paper in books and reels manufactured in UKwww.johnsontestpapers.com Chemistry Ads * Chemistry com * Chemistry * Chemistry Help * Chemistry Experiments * Concentration Problem An acid-base titration is a neutralization reaction that is performed in the lab in order to determine an unknown concentration of acid or base. The moles of acid will equal the moles of base at the equivalence point. Here's how to perform the calculation to find your unknown. For example, if you are titrating hydrochloric acid with sodium hydroxide: HCl + NaOH → NaCl + H2O You can see from the equation there is a 1:1 molar ratio between HCl and NaOH.