Weak acid-base indicator equilibria
Step 1: Obtain a small test tube and add approximately 5mL water. Next, add 10 drops of a methyl violet indicator, and record the color of the solution.
Step 2: Add ~4 drops of 6 M HCl to the solution, and record the color of the solution.
(be careful when handling concentrated acids and bases)
Step 3: Add 6 M NaOH until the color of the solution shifts back to its original color. Estimate the pH range of the solution. You may also test the acidity with a pH paper.
Step 4: Add a small test tube, and add approximately 5 mL water. Next add 10 drops of cabbage juice, and record the color of the solution.
Step 5: Add ~4 drops of 6 M NaOH to the solution and record the color of the solution.
Step 6: Add 6 M HCl until the color of the solution shifts back to its original color. Estimate the pH range of the solution from the color of the solution. You may also test the acidity with a pH paper.
1.Write the equilibrium reactions.
2. Calculate the concentration of the hydronium ion from the pH value,
Weak acid-base indicator equilibria Step 1: Obtain a small test tube and add approximately 5mL wa...
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is to indicate the of the titration. Use Table 10.2 for the following question. If an acidic solution is titrated with a basic solution and methyl violet is used as an indicator, the solution color will change from to QUESTION 2 3 points Save Answer The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCI (aq) in 133 mL of water...
Acid, bases and buffers
Acids, Bases, and Buffers CHEM& 121 Lab Partner Data Part A Red pH Red Cabbage Test Tube Blue Litmus (color) Solution Juice (color)values (colbr) no reaction 2.890 Magenta 11.37dark green Red blue no reaction 2.700 Magenta lemon juice soft drink drain cleaner no reaction detergent baking soda no reaction red red no raction 3.530 Purple blue 12.56 no reactionno reaction 8.700 dark green 9.350 teal/green Part B Total Number of rops of HCl(aq) Added DI Water...
PROCEDURES and DATA COLLECTION: PART A. Observe the changes in pH of both buffered and non-bsuffered selutions digital pH meters if working pH meters are available using universal pH paper and/or 1. Obtain a package of universal pH paper with a color chart and a digital pH meter if they are available. 2. Obtain 6 medium sized test tubes and label them 1-6 (confirm that the pH meter probe will fit inside) THE TEST TUBES are clean, with clean and...
First distilled water was added to a test tube. Then methyl
orange indicator was added. The HCl and NaOH.
Part 1B: Acid/Base Indicator Equilibrium Chemical Reaction involved Initial color of the solution: 1. Adding HCI: a. Color change b. Equilibrium shifting 2. Adding NaOH: a. Color change b. Equilibrium shifting
Identify an unknown solution (1, 2, 3 and 4) and fill
the vacancies in the table
Procedure
The unknown solutions are : HCl, NaOH,
Acetic acid, Na2CO3
Test each solution with litmus paper. Record the results in the
data table below.
Take little of each solution in a test tube and add 5 drops of
silver nitrate to each solution. Record the results in the data
table.
Take little of each solution in a test tube and add two drops...
Identify an unknown solution (1, 2, 3 and 4) and fill the vacancies in the table Procedure The unknown solutions are : HCI, NaOH, Acetic acid, Na2CO3 1- Test each solution with litmus paper. Record the results in the data table below. 2- Take little of each solution in a test tube and add 5 drops of silver nitrate to each solution. Record the results in the data table. 3- Take little of each solution in a test tube and...
just
need ionic equation + net ionic equation
small test tube. Add a few drops of 1.0 M hydrochloric acid in the test tube and records wie t observations. Our C. Take a small amount of sodium hydrogen carbonate (sodium bicarbonate) and n seation fizynbbleo Names: icak water Canoe Observations: chtonde + CO2 H2O →Nach + HCI (a 1) lonic Eqn. Net lonic Eqn: ake a small amount of sodium hydrogen carbonate (sodium bicarbonate) and place it in a Add...
Part I Color changes of Methyl Violet. We will study the following reaction: HMV (aq) + MV (aq) + H* (aq) yellow greenish-blue violet Step 1. Place about 4 mL of distilled water in a regular test tube. Add two drops of methyl violet indicator. Record the color of the solution. Violet Next, add drop by drop, add 6M HCI. This forces equilibrium to be shifted to the left or right-circle the right answer). Adding HCl changes color from to...
174 Problems and questions 1. Compare and contrast the three methods used to test pH (red cabbage indicator, pH paper, and a pH meter). Did they give similar results? Which is the most accurate? Explain. 2. The hydroxide ion concentration of a solution is 2.5 x 10 M. What is the hydronium ion concentration? a) What is the pH? b) Is the solution acidic, basic, or neutral? c) 3. A few drops of HCl are added to two solutions, A...
considering data from part D which solution was the most
effective at resisting a change in ph when NaOH was added? offer an
explanation for this difference in behavior compared to the other
solutions.
ame Lab 16 ab Partner DATA SHE ab Section Date (conti Part D: Buffer Solutions Testing Buffer Solution pH: HC pH after Addition of 0.1 M HCI Test Tube 0 drops Sample 1 drops 6 drops 11 drops 11 drops + 1 mL 11 drops +2...