Investigating The Properties Of An Unknown Compound

Unknown white compound (823U) was discovered in the lab. In order to dispose of it correctly, the substance and its physical and chemical properties had to be identified. The unknown white compound was one of a list of 15 compounds. 5g of the unknown compound were given in order to correctly identify and discover its physical and chemical properties. In order to do so, a solubility test, a flame test, and ion tests were conducted. From the results of these initial tests and the given list of compounds, the unknown white compound was thought to be composed of sodium and a halide (I-, Br-, or Cl-). Of the list, NaCl was the appropriate compound, however NaC2H3O3 was also tested out of skepticism. To verify the identity of the substance, the solubility and flame tests were performed again along with a pH test. The pH tests of NaCl and NaC2H3O2 did not match that of the unknown white compound. The list of compounds had been entirely ruled out. The identity of the unknown white compound was revealed to be calcium chloride. To synthesize at least a gram (calculated to produce 1.2g) of CaCl2, the following reaction was completed.

Title: Using pHydrion paper to test the pH of vinegar, distilled water, laundry detergent, milk, NaOH, Mr. Clean, Baking Soda, Ammonia, 7up, Gatorade, and 4 unknown substances.

Acid-base indicators are used widely in research & development and in industry. Certain uses can include checking the pH of a swimming pool as a pH outside of a certain range will either harm swimmers or will not properly clean the pool. Another use of checking the pH of water is in the case of effluent testing, where outflow from a production site is tested for acidity or alkalinity to determine the effect it will have on aquatic organisms in the area.

The purpose of this study was to observe the effects of various pHs, temperatures, chemical

The objective of this experiment is to see how safe bottled and tap water is to drink based on what is in the water; specifically the contaminants and the pH balance of the water. As well as if the temperature of the environment that the water is placed in affects the pH balance of the water along with if bacteria is grown due to the condition it is in. Water is one of the most important things in life, being as it is known as the universal solvent, and humans and many other animals need it to survive. Along with water, the balance of pH is also extremely important in the maintenance of any organism 's life, including the lives of humans. Temperature is known to affect the speed of movements of ions within a solution. There are specific

“Your research team has been called to the site of a former manufacturing facility that used acids and bases in the dyeing of fabrics. The problem is that the drums of acids and bases are not labeled. Your task is to identify whether your substance is an acid or a base. You then need to determine if it is a strong acid, weak acid, strong base or weak base. In addition you should identify which acid or base you have. Finally, you want to do further testing by performing a pH titration on each of your unknowns. This will help you determine the concentration of your unknowns.

However much reagent needed to change the colour of the solution (thereby having a chemical reaction) is recorded ("Acid-Base Titrations - Chemwiki", 2013). Phenolphthalein is an example of an acid-base indicator, which are used to test the pH of a substance by changing the colour. This indicator weak and colourless, but when mixed with water it forms pink anions. The pH range of phenolphthalein is 8.2-10.0. Indicators are an important part of acid-base titrations as they are the main signal of a chemical reaction and completion of the test ("ACID_BASE INDICATORS", 2016).

Experiment 5 titled “Acids, Bases, Salt, and pH”. The purpose of this lab is to become familiar with some properties of salt, bases, and acids, measure acidity (pH), and correlate abnormal acidity of blood or urine. The activities for this lab is to measure the pH of some acid solutions and base solutions using pH paper/meter, and neutralize an acid solution by reacting with base solutions. To begin this experiment (Acid), there will be bottles of different acids (hydrochloric, nitric acid, sulfuric, and acetic acids) on top of the bench. Place one drop of each acid on a blue and red litmus paper and then place a drop of each liquid on (pH) paper. Record the observations. For the Base, place one drop of each liquid (sodium hydroxide, ammonium

The lab’s purpose is to standardize a prepared sodium hydroxide solution and use it to determine the molarity of an unknown acid. Moreover, acids and bases react with the known stoichiometric ratios based on the coefficients of the balanced chemical reactions. If the stoichiometric ratio of an acid-base reaction is known the unknown concentration can be determined, however the reaction must have gone through completion and the number of moles of one of the components needs to known. The pH scale can be used to determine the change in concentration of an acid or base. The pH scale is calculated through the formula (pH = -log[H+]). Furthermore, when an acidic compound interacts with basic compound, the concentration of hydrogen decreases, therefore

The experiment have successfully identified the unknown acid #4 as Potassium Hydrogen Tartate and observe the similarities of pKa through the process of titration. The results of the experiment have been improved with usage of reasonable, consistant working pH meter. Molecular weight of the unknown acid can be measured to absolute consistance if the room tempature can be maintained at 25 C, with no wind or breaze in the room. The main skill needed for such lab like titration is concentration, over titrating in part I can b e avoided with meticulous control of buret. The final results were resonable, managing to perform small portion of experiment again.

From this lab experiment, I can conclude that the red cabbage solution is an effective indicator for the acidic, basic and neutral chemical compounds. I learned that the universal indicator is also a good solution for the three types of compounds. The colours are different depending on what substance you are testing. The colours that we discovered in the pH scale are pink, red or orange. As for bases the colour was either light or dark green sometimes yellow. The colours for neutral, were violet or purple.In real life we are exposed to acids and bases everyday. For example, citric acid is in lots of citrus foods such as lemons, oranges and grapefruits. It is also added to foods for flavouring, non perishable, and cleaning supply. Citric acid creates a taste that is sweet and sour.

In test tube B, which contained vinegar, a substance which has a pH that is very close to 3 as seen in Fig. 8 on the pH indicator paper which became a very bright orange when dipped in the orange to test for the pH level. This reaction also had a fairly slow start, however the rate of reaction never ended up increasing rapidly, which is

The purpose of this experiment was to find the molarity of a concentration and the acid-base titration. In part A of this experiment, the molarity of an assigned concentration which was 0.040, was found using formulas that represent molarity. Part B of this experiment, which was titration of an acid and base, was found by a series of steps that involved dropping Sodium Hydroxide from a buret into vinegar, until the perfect shade of pale pink occurred. With the Phenolphthalein, too much acid causes the base to turn a dark pink. The molarity was then found of the titration. So the end results will determine M HCH3O2.

The pH scale measures the concentration of hydrogen ions found in substances. This system tracks the number of decimal places in a hydrogen ion concentration without writing them out. Each whole number on the pH scale (0-14) represents a tenfold difference in hydrogen ion concentration. (1) When the hydrogen ion concentration increases, the pH number decreases. (2) When the hydrogen ion concentration decreases, the pH number increases.

For this experiment, a weak acid-buffer titration will be performed. While acids produce hydronium ions in water, bases produce hydroxide ions. To determine how strong an acid or base is, levels of dissociation are observed. While a strong acid or base entirely dissociates in solution, a weak acid or base only partially dissociates in solution. The extent to which a weak acid dissociates in an aqueous solution can be denoted by the constant, Ka, which stands for the ratio in products to reactant. The following equation is used to describe the mentioned ratio in an acid-dissociation: