4 0050ChemicalsforDisposalwwwwwwwwMETHODE BESET MY NOTEA0.055 M NaSodium hydroxideLab DataConcentration of NaOH (M)Initial volume of buret (mL)Concentration of unknown acid (M)Volume of unknown acid (mL)Initial pH of weak acid solutionBuret volume (mL)Wash/WastepH of solution0.0550.0100.00110Total volume of NaOH added(mL)-XDIWaterPHASE 2:Prepare buret and unknown acidsampleComplete the following steps:Fill buret with 0.055 M sodium hydroxide.Record concentration of sodiumhydroxide and initial buret volume in LabDataRecap Erlenmeyer flask of sodiumhydroxide solutionUse volumetric pipet to add 10.00 mL of0.10 Munknown acid to cleanErlenymeyer flask. Record exact volumeand concentration of unknown acid inLab Data

Answered: Image /qna-images/answer/e2a87fa7-251d-498c-81e1-f3be71790d17.jpg

Concentration of NaOH (M) Initial volume of buret (mL) Concentration of unknown acid (M) Volume of unknown acid (mL) Initial pH of weak acid solution Buret volume (ml) pH of solution 0.055 0.010 0.001 10 Total volume of NaOH added (mL) DI Water

Concentration of NaOH (M) Initial volume of buret (mL) Concentration of unknown acid (M) Volume of unknown acid (mL) Initial pH of weak acid solution Buret volume (ml) pH of solution 0.055 0.010 0.001 10 Total volume of NaOH added (mL) DI Water

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 58P

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A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
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,…
Prepared buffer solution GivenAmmonia Volume = 68 mL | Ammonia Concentration = 0.17 MAmmonium Chloride Volume = 42 mL | Ammonium Chloride Concentration = 0.13 MDissociation Constant of Ammonia: 1.8x10-5What is the total vol. of buffer
Prepared buffer solution GivenAmmonia Volume = 68 mL | Ammonia Concentration = 0.17 MAmmonium Chloride Volume = 42 mL | Ammonium Chloride Concentration = 0.13 MDissociation Constant of Ammonia: 1.8x10-5What is the final concentration of the base
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In Trial 1 0.5 grams of KHP were dissolved in 100 mL of water and titrated with 18.56 mL of NaOH that was later determined to be 0.132 M. Calculate the [C8H4O42-]EqPt , [OH-]EqPt, kb, pOH and pH values for the solution at the Equivalence Point.
Calculate the pH of a solution prepared by mixing 27.0 mL of pure pyridine, C5H5N (d = 0.978 g/mL), with 65.0 mL of 2.75 M HCl. Kb for pyridine is 1.5 × 10-9. Show an equation (and ICE table as needed) along with work.
A 250 cm3 volumetric flask contains exactly 200,0 cm3 of a 0,025 mol.dm3sulphuric acid solution. Thereafter ten (10) sodium hydroxide pellets, eachof mass 0,1 g are dropped into the flask. After the pellets have dissolvedcompletely, the flask is topped to the 250 cm3 mark with water and thecontents are thoroughly homogenised. Determine the pH of the resultingsolution.
(2). For the buffer system, what will be the pH when (a) 15.0 ml of 0.500 M HCl and (b) when 15.0 ml of 0.750 M NaOH is added to the buffer? Given: • 20.0 ml of 3.00 M sodium bicarbonate = conjugate base in molarity [? −] • 50.0 ML OF 2.00 M carbonic acid = weak acid in molarity [??] • 4.30 × 10−7 ?? of carbonic = ??? (acid-dissociation constant) • Base: (a) 15.0 ml of 0.500 M HCl (b) 15.0 ml of 0.750 M NaOH
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At 25oC, a 100mL solution is found to contain 20% by mass acetic acid (CH3COOH). The density of the solution is 1.05g/cm3. If this solution is diluted further to form 700mL, what will be the A) [OH-], B) pH and C) % dissociation of the resulting acetic acid solution? CH3COOH -> H+ + CH3COO- (Kb = 5.56x10-10)
MULTIPLE CHOICE: Choose the best answer. Encircle your answer then write the letter before the number. A. These substances react with bases to form Acids Bases Salts Alkalinesubstances B. This is the process wherein charged particlesthat are already existing in the compound tend to Dissociation Ionization Dissolution Diffusion C. Thisvalue represents the quantitative measure of the strength of an acid in pH ka [H+] Allof the above D. Sulfuricacid is a/an: Monoproticacid Polyproticacid Weakacid Acidicsalt E. Thefollowing theories describe acids and bases, EXCEPT: Arrhenius Lewis Michaelis-Menten Bronsted-LowryTheory F. Thistheory states that acids are electron pair acceptors: Arrhenius Lewis Michaelis-Menten Bronsted-LowryTheory G. Thistheory states that bases are capable of furnishing hydroxide ions in aqueous Arrhenius Lewis Michaelis-Menten Bronsted-LowryTheory H. Thistheory describes acids as proton Arrhenius Lewis…