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- Calculate the volume in liters of 0.545 M KOH necessary to titrate 0.0113 moles of hydrochloric acid, HCl, to a phenolphthalein end-point. Report the answer with three significant figures.Calculate the volume in mL of 0.311 M KOH necessary to titrate 23.38mL of 0.342 M diprotic sulfuric acid, H2SO4 to a phenolphthalein end-point. Report your answer to a precision of 2 decimal places.Calculate the volume in milliliters of 0.368 M KOH necessary to titrate 0.0209 moles of acetic acid (HOAc, HC2H3O2) to a phenolphthalein end-point. Report the answer with a precision of two decimal places.
- Give only typing answer with explanation and conclusion to all parts Calculate the concentrations of all species in a 0.490 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are ?a1=1.4×10−2 and ?a2=6.3×10−8. [Na+]= [HSO−3]= [OH−]= [SO2-3]= [H2SO3]= [H+]=In the course of various qualitative analysis procedures, thefollowing mixtures are encountered: (a) Zn2 + and Cd2 + ,(b) Cr(OH)3 and Fe(OH)3, (c) Mg2 + and K+, (d) Ag+ andMn2 + . Suggest how each mixture might be separated.A titration system is set up as follows: the bottom flask contains a sample solution of 50.0-mL 0.50 M C2H3NH2(ethylamine), the burette is filled with 0.20 M HCl as titrant. Kb of C2H3NH2 = 6.5 ´ 10-4 what is the pH at the equivalent point?
- A 250.0-mg sample of an organic weak acid is dissolved in an appropriate solvent and titrated with 0.0556 M NaOH, requiring 32.58 mL to reach the end point. Determine the compound’s equivalent weight.The acid-base indicator ethyl orange turns from red to yel-low over the pH range 3.4 to 4.8. Estimate Kₐ for ethyl orange.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
- Need solution urgently 125mL of an alkaline water sample containing 128 ppm carbonate and 40ppm hydroxide in terms of CaCO_(3) equivalent its titrated against 0.20NHCl using methyl orange as the indicator.What will be the titre value (in ml unit)?Determine the [H3O+] of the eight buffer solutions made by mixing 1.10 M acetic acid and 0.900 M sodium acetate solutions according to the following volumes. The pKa for acetic acid, CH3CO2H (HAc), is 4.745. To enter exponential values, use the format 1.0e-5.A 20-mL vial of concentrated ammonium chloride solution containing 5 mEq/mLis diluted to 1 liter with sterile distilled water. Calculate (a) the total milliequivalent value of the ammonium ion in the dilution and (b) the percentage strengthof the dilution.