mass of unknown crude for acid and neutral is 0.03 grams mass of unknown recrystallized for acid and neutral is 0.03 grams. I need help in finding overall percent
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- why is it necessary to test the ph? EXTRME DETAIL PLEASE PROCEDURE To a six inch test tube was added thiamine hydrochloride (0.65 g), followed by water (2mL). The mixture was gently shaken until homogeneous, and then ethanol (7.5 mL)was added. Finally, sodium hydroxide (10%, 1.5 mL) was added and the mixture wasgently stirred to ensure complete mixing.Benzaldehyde (3.8 mL) was then added at room temperature in one portion with gentlestirring. The pH of the resulting reaction mixture was determined and adjusted to >10by dropwise addition of 10% sodium hydroxide.blackboard.learn.xythos.prod/579872cf81db6/2987817?X-Blackboard-S3-Bucket-blackboard.learn.xythos.prod&X-Blackboard-Expiration= 2 / 2 | 100% + CHEM1407 A Homework Ch 16, Sec 6A Name: # 3) A 2.5x10-³M of an unknown acid has a pH of 3.80 at 25C. What is the hydronium ion concentration of the solution? # 4) A 0.15M solution of cyanic acid (HCNO) has a Ka for the acid of 3.5x10-4. What is pH for this acid? # 5) The ionization constant of a very weak acid HA is 4.0x109. Calculate the equilibrium concentrations of H3O+, A-, and HA in a 0.040M solution of the acid. #6) Propoanoic acid, HC3H5O2, is an organic acid with a foul odor. The acid- dissociation constant, Ka, for this acid is 1.4 x10-³M a) write the dissociation equation for this acid b) What is the pH and % dissociation for a 0.25M solution of this acid? 63°F Mostly cloudyDetermine the initial concentrations of the species below, after the solutions are mixed. Volume0.0350 MKMnO4(mL) Volume0.0650 MH2C2O4(mL) VolumeH2O(mL) InitialConcentrationKMnO4(M) InitialConcentrationH2C2O4(M) (3 significant figures) (3 significant figures) 1.00 1.00 18.00 2.00 2.00 16.00 3.00 3.00 14.00 4.00 4.00 12.00 5.00 5.00 10.00
- light data and DID NOT round any intermediate calculations. In a 3.8M aqueous solution of benzoic acid (C6H, CO₂H), what is the percentage of benzoic acid that is dissociated? You can find some data that is useful for solving this problem in the ALEKS Data resource. Round your answer to 2 significant digits. 7.0 % GEE olaUnknown Acid Acid name Acetic acid Group #5 Group #6 Group #7 Mean Standard Deviation % Error STATISTICAL ANALYSIS: Calculate mean values for molar mass, pKa, and Ka. Calculate % error and standard deviation: Unknown acid # 1 Molar Mass of unknown acid (calculated), g/mol Group #1 Group #2 Group #3 Group #4 Reaction Initial conc. / M: Change in conc. at equilibrium / M: Equilibrium conc. / M: Acetic acid | Molar Mass, g/mol: 60.05 | pka = 4.76 Accepted Values Molar mass, g/mol 60.05 Ka = Part II 1. Using initial molarity of acid and measured pH of the acid before titration, build a RICE table and calculate the Ka of the acid. You can use examples 1, 2 (pp. 3-4) from the Manual (posted on Canvas) Initial Molarity of [HA], M 0.219 Initial pH of Acid pka = HA(aq) + H₂O(1) [HA] -X 58.8 57.4 60.4 61.0 58.4 59.2 59.7 59.3 1.13 0.01 [HA] + X 台 pH: H3O+ (aq) = 0 +X 2. Use the Henderson-Hasselbauch equation to perform the same calculation. +X pka 4.76 Ka = pka 4.78 5.00 4.64 4.89 4.62 4.68 4.82…6 PLEASE PROVIDE THE INTERPRETATION OF ALL SAMPLES FOR HELPFUL RATINGS. THANK YOU. *INCLUDE ALL YOUR REFERENCES
- I would need help writing a plan and understanding the experiment: An unknown solid sample is given to you. It is a mixture of KHP & NaCl. Your goal is to find % of KHP in this given unknown sample. Given: Standardized NaOH (made last week) Unknown KHP Sample Computer with pH probe- Logger Pro-Vernier program Digital Burette pH meterMaleic acid (H2C4H2O4, represented by H2M) is the precursor of malic acid widely used in industry. food as an acidulant and in the pharmaceutical industry it is used in the treatment of wounds. This acid can be determined by neutralization titration. Answer the items below about this determination. a) Considering a 15.0 mL sample of maleic acid-based product used in industry, determine the maleic acid concentration, in mol/L, in the sample knowing that 21.7 mL of a solution of 0.1120 mol/L NaOH for complete neutralization of this acid. How many grams of maleic acid were in the sample analyzed and what is its percentage (%, m/v) in the sample? [Answer; m=0.1405 mol/L; percentage = 0.9365%] NaOH(aq) + H2M(aq) ----> Na2M (aq) + H2O(l) b) And Suggest an appropriate indicator for the titration of this acid by looking at the titration curve profile below (image)Along with the drawing of the solution, please explain the solution as well. I am really suck on this one.
- The number of moles of HCl in 100mL of 1.0 MHCl (Show calculations)Answer properly and must do both sub parts a and b Acetic acid (Ka = 1.75 x 10-5 ) and formic acid (Ka = 1.80 x 10-4 ) are both present at equimolar concentrations in 50.0 mL of water (i.e. [acetic acid/[formic acid] = 1.00). If the pH of the solution is 4.5, a. find the distribution ratio of each acid and b. determine what will the concentration ratio, [acetic acid/[formic acid], be after two extractions with 25.0 mL each of chloroform? Hint: Since two solutes are present, each will have their own q expression. KD value for acetic acid = 5.5; KD value for formic acid = 4.⁵solve with complete solution and explanation