An unknown sample containing mixed alkali (NaOH, NaHCO3, or Na2CO3) was analyzed using t double flask method. A 250 mg sample was dissolved in 250 mL CO2 free water. A 20.0 mL aliq of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint u 31.1 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO, only O NAOH and Na,CO3

An unknown sample containing mixed alkali (NaOH, NaHCO3, or Na2CO3) was analyzed using t double flask method. A 250 mg sample was dissolved in 250 mL CO2 free water. A 20.0 mL aliq of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint u 31.1 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO, only O NAOH and Na,CO3

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

If a 0.3 M solution of NaOH was used to titrate 100 mL of 0.3 M solution of CH3COOH (Ka =1.8 x 10 -5) and the following volumes of NaOH were recorded: 102, 97, 99, 98, 101, 106 mL. The pH Value is………………when added 99.0 mL of 0.3 M NaOH The pH of the solution at the equivalence point more than 7 Because................................... Calculate the 99% confidence limits of the mean? And use them to decide whether there is any evidence of systematic error? [ hints: For N=6 and the 99 % confidence interval, the value of t is 4.03].
1.0 g of a solid sample known to contain a mixture of NaOH and Na2CO3 is dissolved with distilled water and completed to 25 mL. By adding 2 drops of phenolphthalein (pT = 9.0) to the solution obtained, it was titrated with 0.107 M calibrated HCl solution, and the consumption was determined as 10.6 mL. Subsequently, 2 drops of methyl red (pT = 4.4) were added onto the same solution and titrated, the consumption was determined as 6.1 mL. Accordingly, calculate the amount of NaOH and Na2CO3 in the sample solution as% (a/a) by writing the related reactions. (Na: 23, C: 12, O: 16, H: 1 g / mol)
please show the method and answers
A 25.0 mL sample of a 0.1300 M solution of aqueous trimethylamine is titrated with a 0.1625 M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pKb of (CH3)3N = 4.19 at 25°C. pH after 10.0 mL of acid have been added pH after 20.0 mL of acid have been added pH after 30.0 mL of acid have been added
A 0.1064-g of aldrin pesticide sample was decomposed and the liberated chloride was extracted using water. It was titrated with 23.28 mL of 0.03337 M AgNO 3 using a chromate indicator. Express results in % aldrin (C 12H 8Cl 6, MM=365). 63.21 % 22.12 % 17.28 % 44.42 %
Qd 56.
You prepare a buffer solution from 10.0 mL of 0.100M MOPS (3‑morpholinopropane‑1‑sulfonic acid) and 10.0 mL of 0.075 M NaOH. Next, you add 1.00 mL of 4.15×10−4 M lidocaine to this mixture. Denoting lidocaine as L, calculate the fraction of lidocaine present in the form LH+. MOPS Ka = 6.3 * 10^-8 Lidocaine Kb = 8.7 * 10^-7 ( Please type answer note write by hend )
How do I determine the volume of NaOH delivered and the molar it’s of the standard NaOH?
50.0 mL of 0.31 M acrylic acid (C2H3COOH, Ka = 1.71 x 10 ) solution is titrated with 0.31 M NaOH to the equivalence point. The %3D reactants are completely transformed into sodium acrylate C2H3COONA at this point. What is the pH of the titration solution at equivalence point? Please keep your answer to two decimal places.
Number 1_ A 0.5707-g sample of a water-soluble fertilizer was dissolved and analysed for nitrogen using the Kjeldahl method. After digestion, the distilled ammonia was collected in 100 mL of 0.1334 M boric acid. This solution required 26.27 mL of 0.202 M HCl for titration to the methyl red end point. Calculate the % N (AW =14 g/mol) in the fertilizer.
Show the three step mechanism to form the major product only for the radical bromination shown below. label the initiation, propagation, and termination steps. draw the FULL electron pushing mechanism with ALL intermediates, lone pairs, and formal charges clearly labelled. Show ALL electron pushing arrows and label the nucleophile and electrophile where appropriate for non-radical mechanisms.
I did an experiment called Potentiometric Analyses where we titrate NaOH with a solid unknown weak acid. Our group was told that our weak acid is diprotic. Mass of dry, solid acid = .155g Molar concentration of NaOH (mol/L)= 0.100 Buret reading of NaOH, initial (mL)= 50 mL Buret reading NaOH at stocichiometric point, final (mL)= 22.1 mL Volume of NaOH dispensed (mL) 27.9 mL Moles of NaOH to stoichiometric point (mol) : _____________ (I think the above answer would be 2.79 x 10-2? if yes then skip) Moles of acid (mol) _____________ Molar mass of acid (g/mol) __________ Note: In the book it says for a diprotic acid, 2 mol of OH-, neutralizes one mole of acid.