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- (b) Calculate the pH of 0.0005 mol dm-3 ethanoic acid when its pKa = 4.75 and explain the assumptions made in the calculations CH3COOH(aq) à CH3COO-(aq) + H+(aq) Ka = pH = 3.1 (a) Define and write the expression of Kw for the dissociation of water (H2O). Kw is the ____________________ _____________ of _________________ Kw = (b) Calculate the pH of 0.1 mol dm-3 potassium hydroxide (KOH(aq)) pH = 10. Explain briefly the effect of temperature on Kw.What would be the most efficient way to make up a HEPES buffer at pH 8.5? And what starting compounds/reagants would be cohsen to use.A 10.00cm3 portion of the 100.00cm3 HCl solut was taken from the volumetric flask and was titrated with KOH (aq). It was neeutralized by 24.35cm3 of potassium hydroxide od concentration 0.0500moldm-3. Calculate the concentrat of the original concentrated hydrochloric acid in moldm-3.
- A biochemical reaction takes place in a 1.00 ml solution of 0.0250 Mphosphate buffer initially at pH = 7.20 (as shown for pKas of phosphatespecies).(a) Are the concentrations of any of the four possible phosphate speciesnegligible? If so, identify them and explain your answer.(b) During the reaction, 3.80 μmol of HCl are produced. Calculate the finalpH of the reaction solution. Assume that the HCl is completely neutralizedby the buffer.A suitable target for the titration is 30.0 cm3 of 0.025 moldm-3 Br2(aq) Justify why a much smaller target titre would not be appropriate Calculate the amount in moles of bromine in the target titer Justification? calculate a suitable massof alive oil to transfer to the volumetric flask using your answer to of above question and the structure of Y Assume that the olive oil contains 85/- of Y by mass (If you were unable to calculate the amount of bromine in the target titer,you should assume it is 6.25×10^-8 mol .this in not the correct amount)How many grams of dipotassium phtalate (MW = 242.31 g/mol) should be added to 30.00 mL of 0.400 M HClO4 to give a pH of 5.10 when the solution is diluted to 500 mL? I
- If all the N in 10.0 mmols urea, CO(NH2)2, is converted to NH4HSO4, and if, with excess NaOH, the NH3 is evolved and caught in 50.0 mL of HCl (1.00 mL = 0.03000 g CaCO3), what volume of NaOH (1.00 mL = 0.3465 g H2C2O4. H2O) would be required for complete titration?a solution of phenylhydrazine (C6H5-NH-NH2) with ionic strength 0.1 mol/L has pH = 8.13. Determines the pKa for the phenylhydrazinium ion (C6H5-NH-NH3+)write a dissociation equation for and give the proper concentration for a .25M K2SO4 solution i
- ans asap In the use of EDTA as the complexometric titrant, at what pH value/s does Y4- become a major component of solutions? -At pH 1 -At pH 7 -At pH values lower than 10 -At pH values greater than 10Phosphoric acid (H3PO4) is triprotic, with pKa's of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 13.2 isCalculate the volume (ml)of concentrated ammonia and the weight (gm) of ammonium chloride respectively to be taken to prepare 100 ml of buffer solution at a pH of 10 if the final concentration of the salt is 0.20 mol. Note that the molar concentration of concentrated ammonia is equal to 14.8 mol/liter, and that the pKb of ammonia is 4.76, and the molecular weight of ammonium :chloride 53.5 g/mole.lt is about