Chem 106 Identification of an Acid Lab Report

Consider the following chemical equilibrium: HCOO- (aq) + H2O(aq) = HCOOH (aq) + OH- (aq). Which of the following graphs represents the perturbation on the system and the change of pH when HCI is added to the container? III PH PH ↑ time time IV PH Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b || C III d IV pH time time Open Your answer

A solution is prepared that is initially 0.42M in hydrofluoric acid (HF) and 0.28M in potassium fluoride (KF). Complete the reaction table below, so that you could use it to calculate the pH of this solution. [H,0°]. Use x to stand for the unknown change in You can leave out the M symbol for molarity. [HF] [F] [1,0'] initial change final

In the laboratory, a general chemistry student measured the pH of a 0.580 M aqueous solution of aniline, C6H5 NH2 to be 9.332. Use the information she obtained to determine the K for this base. K(experiment)

Determine the pH of a solution of aspirin (acetylsalicylic acid, HC9H7O4) by constructing an ICE table, writing the equilibrium constant expression, and using this information to determine the pH. Complete Parts 1-3 before submitting your answer. Initial (M) Change (M) Equilibrium (M) -X NEXT > 652 mg of aspirin (HC9H7O4) is dissolved in an aqueous solution of 237 mL aqueous solution. Fill in the ICE table with the appropriate value for each involved species to determine concentrations of all reactants and products. 15.3-x PO annotated-Acid-B....pdf A 0 1 HC9H7O4(aq) + 2.75 x 10-³+x 0.0153 + x 2.75 x 10-3 2.75 x 10-x 0.0153-x 2 H₂O(1) 3.62 x 10-3 3.62 x 10³+x 1.53 x 10-5 3.62 x 10-x 3 H3O+ (aq) + C9H7O4 (aq) 15.3 1.53 x 105+x 0.0153 1.53 x 10-5-x RESET 15.3 + x

The pH range of a solution can also be determined using indicators. Indicators are molecules that exhibit different colors over a specific pH range. Examples of indicators and the associated colors are shown below. pH Range and Colors 1 2 3 Indicator 4 6 7 Bromcresol green |Congo Red Methyl Yellow Thymol Blue Methyl Violet pH Range and Colors Indicator 2 3 4 5 7 Bromcresol green yellow Oblue Congo Red Methyl Yellow Thymol Blue Methyl Violet Jorange-red Dyellow Dyellow blue red red yellow Oviolet Bromcresol green, for example, would be green between pH 4-5, and gradually change to blue

You are studying a clear solution and you added the pH indicator methyl violet. The colour range of the indicator methyl violet in a clear solution when changing from acidic to basic is yellow (pH 0) to blue purple (pH 1) to violet (pH 2). You initial pH of the solution when tested with a pH meter is O.2. You are going to add 250 drops of 0.1 M HCI. Please select the most appropriate answers to the following two questions. What is the initial colour of the solution at pH 0.2? What is the colour of the solution and what will the pH be after the addition of the HCI? Select 2 correct answer(s) The colour of the solution after the addition of HCI will be clear and the pH will be less than 0.2. The colour of the solution after the addition of HCI will be violet and the pH will be higher than 0.2.