It was found that the unknown mixture was comprised of 49.8% NaCl, 36.8% SiO2, and 13% CaCO3. Introduction The key to this experiment is to understand solubility and know how to use the solubility of certain components to separate mixtures. Knowing which components are soluble in the solutes that are available proves to be very advantageous. To start the experiment, the unknown ternary mixture will be added to water to produce a solution that includes all of the components of the original mixture (NaCl, SiO2, CaCO3). Since the sodium chloride is soluble in water, gravity filtration will allow for separation of the calcium carbonate and sand (residue) from the NaCl+H2O (filtrate) solution.
6. Zinc Sheet: a rectangular, thin, sheet like metal, gray/silver. 6 5 4 3 2 1 * Solubility of solid iodine; 1. Solid iodine in 1 mL of water is slightly soluble, because the solution turns into a light brown/yellow color. However majority of the solid Iodine was left at the bottom of the test tube; which leads to the conclusion that it’s not reactive on water.
The ideal gas constant value is 0.082057 (L x atm)÷(mol x K). The purpose of the experiment was to be able to measure the temperature and the mass of each gas tested, to configure a constant and determine which gas is the most “ideal”. To configure “R” the equation will be, R= PV ÷ nT. Based on our knowledge of an ideal gas, we hypothesized Pentane will have the most ideal behavior to real gas and Cyclohexane to be the least ideal. We expect Pentane to be the most ideal because it’s boiling point is the furthest away from the boiling point of water.
The purpose of this experiment is to clarify these important distinctions. The physical properties of a substance are those properties that can be observed and measured without changing the composition of the substance. Physical properties include odor, color, density, solubility, boiling point, and melting point. Because they depend on there being no change in composition, physical properties can be used to describe and identify substances. A colorless, odorless liquid that freezes at 0°C is probably water, for example.
Hydrogen combines with oxygen to make water which is essential to life Hydrogen gas (H2) is colorless, odorless and the most abundant element in the universe, it is less dense than air or water. The method that is going to be used to collect the H2 gas is water displacement measured in Ml. moles of H2 will be found by converting Ml to moles by dividing the number of Ml of H2O displaced by the atomic mas of magnesium (24.3 g). units that will be used for PV=nRT: p- Kpa, V- Liters, n- Moles, R- 8.31, T- kelvins. The final step will be to find the theoretical experimental yield and percent yield.
When referring to mass sum of the atomic masses of the atoms represented by the formula of a molecular substance, the correct term used is A. atomic mass B. formula weight C. molecular mass D. molecular weight 12. A mole of CO2 contians A. 6.02 x 1023 ions C. 6.02 x 1023 formula ions B. 6.02 x 1023 molecules D. 6.02 x 1023 atoms 13. The mass of the products in a chemical reaction depends on the amount of A. excess reactant B. limiting reactant C. oxidizing agent D. reducing subtannce 14.
When water is added to a mixture of salt and sand, the salt dissolves, but the sand does not. The mixture can then be separated by a simple filtration. The salt leaves with the water and the sand is trapped on the filter. Neither the salt nor the sand has been chemically changed. In this laboratory, we used physical and chemical properties to separate the components of a ternary (three substances) mixture.
Each of these indicators will be used to show the various colors created when diluting the acids and bases. When measuring the dilutions 1.0 M HCl can be serially diluted from pH < 1 until its pH reaches 7.0 and 1.0 M NaOH can also be diluted from pH > 14 until it reaches 7.0. In the middle well there is just purely water because it is the most neutral substance, neither acidic nor basic. Water has Hydrogen and hydroxide ions, which helps determine if the substance is an acid or base. The acids are determined on how much H they have and bases are determined on how much they mess with the hydrogen concentration.
A majority of the impurities will remain in the solution and the main compound has been purified. Percent recovery is determined at the end of the procedure because it is not possible to recover the entire compound. To maximize the percent recovery, it is critical to use the minimum amount of the heated solvent. When choosing the solvent in this process, it is important to remember that like dissolves like, meaning that a nonpolar compound will dissolve appropriately in a nonpolar solvent, and a polar solvent will appropriately dissolve in a polar solvent. An ideal solvent for recrystallization should dissolve the entire compound once the solvent is boiling, and dissolve minimal amounts of the compound at room temperature.
Lab #3/Limiting Reagents Abstract The purpose of this laboratory experiment was to determine whether an unknown compound was sodium carbonate or sodium hydrogen carbonate by reacting a sample of it with hydrochloric acid and comparing the resulting yield of NaCl to the calculated values. The mass of an evaporating dish was taken at the start of the experiment. Then the unknown carbonate A was added in the amount of approximately one gram. The dish was weighed once more to find the definite mass of the unknown carbonate. Then, by means of a dropper bottle and stirring rod, hydrochloric acid was added until all of the unknown carbonate appeared to have reacted.