A series of acid-base indicators were added to four separate samples of a solution with an unknown pH. Resulting Indicator Colours After Addition to Sample Indicator Added Colour Observed Methyl orange Phenolphthalein Chlorophenol red Methyl red Yellow Colourless Yellow Orange 07 8.
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Q: indicator is best suited for the analyte?
A: PH lies between the pKin-1<pH<pKin+1
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A: the answer is as follows:
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A: The answer is as follows:
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- You were asked to estimate the pH of a 15mL of 0.09N of HCl when 16.9mL of 0.085N NaOH is added to a solution. Your supervisor informed you that she added 100 mL of diluent. With your computed pH and Phenolphthalein as the indicator [pH range: 8.00 – 10.00], would you expect a color change? Yes or No?In the experiment, we used titration to determine the total acid content ofsamples, which we reported in terms of molarity. Reporting acidity through pHmeasurements is quite different, in that we can only measure the amount of theacid in its ionized form. You were tasked to investigate a clear aqueous solutionof an unknown monoprotic acid. You decided to use two methods togather data.Method 1 – TITRATION: A 10. mL aliquot of the sample was diluted with 25 mLdistilled water. Two drops of phenolphthalein were added and then it was titrated3.54 mL of 0.048 M standardized NaOH to the endpoint.Method 2 – pH STRIP: You took 1 mL of the sample and used a pH strip toestimate the pH, which turned out to be around 3.3. Another 1 mL of the samplewas diluted with 9 mL of water. The pH was taken again and is now around 3.8.a) Calculate the molarity of the acid using the titration data.b) If we assume that the titrated unknown is a strong acid, predict thepH of the sample.c) Using pH strip results,…Phenolphthalein indicator is a weak acid with Ka = 10-9 mol/dm-3. It is colourless while its conjugate base is pink in solution. Define the term" WEAK ACID"
- Determine the pH of the following solutions, given that Ka (HF) = 6.8 x 10-4.Hint: 1. Diagnose the scenario (i.e. strong acid + weak base, etc.), 2. If buffer solution, make useof Henderson-Hasselback eqn and 3. If strong acid/base added to buffer, write out reaction withstrong acid or base on the left hand side, then calculate ICE change. a. 0.5 moles of NaF b. A solution with 0.5 moles HF (Ka = 6.8 x 10^-4) and 0.5 moles NaF, to which 0.1 moles HClis added.I have contacted Bartleby customer support and they said this question is valid to be asked! They have said if someone denys again, i can contact them back and they will know who has declined and have a talk with them! Dont cause any issues! Use acid-base titration to determine theconcentration of:– A weak acid: CH3COOH 0.100 M NaOH (standardized)•0.100 M HCl0.100 M CH3COOH Phenolphthalein is used for endpoint determination– Changes from colourless to pink as a solution becomes more basic• Only need 2-3 drops per titration• pH range: 8.3-10What is the best indicator to use for titration of HCL and THAM (tromethamine)? Options are methyl orange, bromophenol blue and phenolphthalein.
- How to write the methodology? I have a practical of the MEASUREMENT USING PH METER, I don't know how to write the methodology. Here is the introduction: A pH meter is an electronic device mainly used for qualitative measurement, for thedetermination of acid and the basic value of a solution. Generally, it measures thehydrogen ion concentration/activity [H+] in a solution. It is denoted as:pH = - log10 [H+]In a pure water solution, the concentration of [H+] and [OH-] ions, respectively, rangefrom 1.0 x 10-1 M to 1.0 x 10-14 M. When [H+] is equal to [OH-] as when pure waterdissociates, the hydrogen ion concentration of pure water is equal to 1.0 x 10-7 M orpH = 7.00, defined as a neutral solution at 25°C, to be of temperaturedependent/endothermic dissociation.[H+] = [OH-] = 1.0 x 10-7 MWhen an ionic or polar substance is dissolved in water, it may change the relativenumbers of H+ and OH-. The higher the pH number, the lower the hydrogen ion concentration, and vice versa. Solution with an…A 10.00 mL sample of acetic acid (CH3COOH) and a few drops of phenolphthalein indicator are addedto a conical flask. From burette, 0.75 M NaOH is slowly added. When phenolphthalein indicator turns a lightpink, reading noted was 8.3 ml. Calculate the concentration of acid present in flask. Also write equation.A professor prepares a buffer solution that they need for the purification of protein from human cell lysates. They did mix weak acid and conjugate base and obtained the initial solution, which is characterised by these parameters. Final volume: 200mltotal buffer compound concentration: 150mMIntitial concentration weak acid: 0.03MInitial concentration conjugate base: 0.12MInitial pH 6.9buffer compound pka 6.3
- What is the percentage of total acid expressed as acetic acid (CH3COOH) in a sample of vinegar if 3.000 g of the vinegar require 20.50 mL of 0.1150 N KOH solution for an end point with phenolphthalein indicator?Thymol blue is a unique indicator that has two set of color change, red to yellow near pH = 1.5 andyellow to blue near pH = 9.00. If a HCl-NaOH titration set-up used thymol blue as an indicator, whatwould be the color of the solution where the titrant and titrand are equimolar with each other?LESSON: Acid-Base TitrationAnswer the following questions.1. Why is there a need to use CO2-free water in a dimensional analysis?