• If the unknown is vinegar (Note 1), pipet 25.00 mL into a 250 mL volumetric flask and dilute to the mark with distilled water. Mix thoroughly and pipet 50,00 ml aliquots into 250 mL conical flasks, Add about 50 mL of water and 2 drops of phenolphthalein (Note 2) to cach, and titrate with standard 0,1 M NaOH to the first permanent (30 seconds) pink color. Report the ackdity of vinegar as percantage (w/v) CH,COOH (60.053g.mol). Titration Initial volume (ml) final volume (ml) Volume used (nl)? 1 0,75 25.50 2 1.25 26.05 3. 1.75 25.99 4 2,55 27.87 5 1,90 26.97 Calculate the concentration or acid content of vinegars in grams per litter.

• If the unknown is vinegar (Note 1), pipet 25.00 mL into a 250 mL volumetric flask and dilute to the mark with distilled water. Mix thoroughly and pipet 50,00 ml aliquots into 250 mL conical flasks, Add about 50 mL of water and 2 drops of phenolphthalein (Note 2) to cach, and titrate with standard 0,1 M NaOH to the first permanent (30 seconds) pink color. Report the ackdity of vinegar as percantage (w/v) CH,COOH (60.053g.mol). Titration Initial volume (ml) final volume (ml) Volume used (nl)? 1 0,75 25.50 2 1.25 26.05 3. 1.75 25.99 4 2,55 27.87 5 1,90 26.97 Calculate the concentration or acid content of vinegars in grams per litter.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.20QAP

See similar textbooks

Similar questions

3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww ww
3.) In the assay of NaHCO3, 3.0g of the solid is dissolved in 25mL water. What is the normality? How many mL of 1N H2SO4 will be required to neutralize this solution? From this volume of acid, compute the percent purity of NaHCO3.
Calculate the percentage CH3COOH in a sample of vinegar from the following data.Sample = 15.00 g, NaOH used = 43.00 ml ; 0.600 N H2SO4 used for back titration =0.250 ml ; 1.00ml NaOH is equivalent to 0.0315 g H2C2O4. 2H2O.
Calculate the molarity of a dilute Ba(OH)2 solution if addition of 99.52 mL of the base to 0.6426 g of benzoic acid (MW=122.12g/mole) include the UNIT) required a 4.2887 mL back-titration with 0.02274 M HCI. (Answers should be written in 2 decimals place and do not
A shipment of containing NaOH (40 g/mol) and Na2CO3 (106 g/mol) was declared to contain less than 10 % impurity. However, Noel is suspicious that the declared impurity is higher. Being the best and brightest employee of the year, Noel weighed 1.000 g sample, dissolved in 50.0 mL of distilled water and titrated with cold 0.5000 M HCl. With Phenolphthalein as indicator, the solution turns colorless after the addition of 30.00 mL of the acid. Methyl Orange is then added, and 5.00 mL more of the acid is required before this this indicator changes color. Calculate the following: a. Determine the volume of the acid to fully neutralize NaOH (final answer up to one decimal place) =
What weight of potassium hydrogen phthalate will require 30. mL of a 0.30M NaOH solution to reach the equivalence point? KHP MM 204.22 g/mol .CO;K' .CO;K' NaOH + H2O + *CO,H COƠ,Na'
Y Part A As a technician in a large pharmaceutical research firm, you need to produce 450. mL of 1.00 M potassium phosphate buffer solution of pH 6.84. The pK, of H₂PO, is 7.21. You have the following supplies: 2.00 L of 1.00 M KH, PO, stock solution, 1.50 L of 1.00 M K₂HPO, stock solution, and a carboy of pure distilled H₂O. How much 1.00 M KH, PO, will you need to make this solution? Express your answer to three significant digits with the appropriate units. View Available Hint(s) Volume of KH₂ PO, needed Submit Previous Answers #A 4 Value X Incorrect; Try Again; 3 attempts remaining The Henderson-Hasselhalch ansation inte 20 Units ?
A 0.5027 g of KHP (KC8H5O4; MW = 204.22 g/mol) required 11.90 mL of NaOH titrant to reach the phenolphthalein endpoint. Calculate the standardized concentration of NaOH.
If 2 ml of 25 N H2SO4 is transferred to 50 ml volumetric flask and complete to mark with ditilled water, the concentration of acid will be .. M* O 2.5 O 1.5 2 O 0.5 0 1 Non of these
Formulate a hypothesis regarding the solubility of aspirin at different pH.The experimentA) Three teaspoons of water (approx. 15 ml) were added to one tablet said to contain 300 mg of aspirin. Fizzingwas observed. Most of the tablet dissolved, but there were some solid particles. By heating the mug in amicrowave for 10 second increments until the water came to the boil (approx. 3x), all of the solid particlesdissolved. The solution was left to cool to room temperature and then placed in a fridge and NOTHINGHAPPENED. Try this yourself if you can spare two aspirin tablets, your results might look different.• Questions to ask:1. What might the fizzing bubbles be?2. Can you give a chemical explanation?3. Can you write a chemical reaction equation with aspirin reacting with something to give a gas and aspirinin another form?4. What might be the formulation (what the manufacturer mixes with aspirin in making the tablet) “trick”for aspirin to improve solubility?5. How does this compare with…
A pharmacist is conducting an analysis of 2.7 g sodium bicarbonate and titrated with 26.05 mL of 0.9987 N HCl. What is the potency or percent assay of sodium bicarbonate? Did it pass the USP requirement? ROUND-OFF TO 2 DECIMAL PLACES. Answer = _% Disposition (Passed or Failed) = _
12. [0/0.25 Points] DETAILS PREVIOUS ANSWERS What volume of 0.242 M HCI is required to neutralize each of the following solutions? (a) 25.0 mL of 0.105 M potassium hydroxide, KOH 4.0 X mL (b) 50.0 mL of 0.00524 M ammonia, NH3 4.0 X mL (c) 20.0 mL of 0.232 M calcium hydroxide, Ca(OH)2 4.0 X mL (d) 15.0 mL of 0.0952 M sodium hydroxide, NaOH 4.0 mL Submit Answer Submit Assignment Save Assignm