Controlled The controlled variables of the experiment were: A. The volume and concentration of the Hydrochloric acid. B. The concentration of the Sodium Hydroxide. Equipment List * Boiling Tube * 10 cm3 1mol dm-3 Hydrochloric Acid (HCL) * 15 cm3 1mol dm-3 Sodium Hydroxide (NaOH) * pH and Temperature Probes * Data Logger * Measuring Cylinder ‘ * Boiling Tube * Teat Pipette Method * Add 10ml of Hydrochloric acid, measured in a measuring cylinder, into a boiling tube.
Metal Name Mass of Metal Volume of water Initial temp. in calorimeter Initial temp. in beaker Final temp. of mixture Aluminum 34.720g 26.0mL 25.4°C 100.6°C 41.6°C Part II: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part II.
This report includes measurements collected from graduated cylinders, balances, and metric rulers, and the densities the data helped calculate. Hypothesis Based on our study of density, we should be able to calculate the mass and volume of each of the seven objects to find their densities and then determine what each of the objects are using the calculated density. Materials and Methods At Lab Station 1, a dry 100mL graduated cylinder was placed on a balance and the mass was recorded in grams to the nearest .01 gram. Approximately 60mL of the Clear Liquid 1 was carefully poured into the graduated cylinder. The graduated cylinder was placed on the scale again (with the added liquid) and the mass was measured in grams to the nearest .01 gram.
Determining the Mass and Flammability of Each Unknown Gas Once the true mass of each flask was determined, the three flasks were each filled with one unknown gas. The flasks were weighed next. As a result of subtracting the mass of the empty flask from the mass of the gas-filled vessels, the number of grams of gas each container held was found. Once this was accomplished, the flammability of each gas was tested in order to provide more accurate evidence for the identity of each unknown substance. RESULTS The first flask held .305 grams; the second, .454 grams; and the third, .477 grams of unknown gas.
So, qwater = qmetal Using the formula qmetal = m × c × ΔT, calculate the specific heat of the metal. Use the data from your experiment for the metal in your calculation. Part II: Calculate the energy change (q) of the surroundings (water) using the enthalpy equation qwater = m × c × ΔT. We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL. Show ALL your work.
Centigram balance: Weighing by difference a) Obtain the second centigram balance. b) Obtain 100ml beaker, and record the mass. c) Transfer the copper slug from the first part of the experiment to the beaker. d) Weigh and record the mass of the beaker + slug. e) Determine the mass of the slug by subtracting the mass of the beaker alone from the mass of the beaker + slug.
Separation of a Solid Mixture Purpose In this experiment I will become familiar with the separation of mixtures of solids. I will also learn separation techniques based on the chemical properties of a substance. Procedure I first measured my weighing dish to find out its mass. I then poured the mixture into the weighing dish and found out the mass of the mixture. I then poured the mixture on to a solid white piece of paper.
Next, I poured a specific amount of each soda into the graduated cylinder to measure its weight with the soda (the amount used was the volume). Then we subtracted the weight that the cylinder had with the sodas in it from the weight of the empty cylinder to find the amount of mass that caused the cylinder's original measured weight to increase,
The mobile phase used in this particular experiment was Methanol and 0.1M sodium dihydrogen phosphate at a ratio of 30:70 and a pH of 4.5, slightly acidic. The stationary phase is the silica based particles packed within the column. The key characteristic of HPLC is the sheer pressure it works under. In fact HPLC is often referred to as high pressure liquid chromatography. The pressure at which the machine used in this investigation works is around 1900psi (pounds per square inch) which is the equivalent of 129.29 atmospheres!
The normality of the unknown base is calculated after the solution has reached the end point. The amount of substance being delivered is calculated in units of equivalents per litre using the formula: VaNa = VbNb Experimental In order to titrate the acid with the unknown base, a solution of the acid was prepared. 5.1722 (±10%)g of potassium hydrogen phthalate acid is obtained using a weighing boat and transferred into a volumetric flask containing 250mL of boiled distilled water. Volumetric flask was shaken several times in order to assist the powder to dissolve. Once dissolved, 24.9734 (± 0.0045)mL of acid was pipetted into an Erlenmeyer flask along with 25mL of cool (recently boiled) distilled water.