Question 39 pt 14,00 10.00 8.00 600 4.00 2.00 0.00 0.00 3.00 10.00 Graph 3 Calculate the K, for the conjugate base. (11.98,5.09) 15.00 20.00 volume of titrant, ml 25.00 30.00 35.00 (24.42,8.68)
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- An aqueous solution containing 0.16 M of unknown base has a measured pH equal to 7.51. What is the value of pKb for the unknown base? Include 3 significant figures in the answerAlanine is a diprotic amino acid with a pKa = 2.344 for the carboxylic group and a pKa = 9.868 for the ammonium group. Estimate the pH of a solution of 0.340 M alanine. Answer using two significant figures.Ajja what is the ph of a 0.10m solution of an acid with a pKa of 8.4?
- A 50.00 (±0.02) mL portion of an HCl solution required 29.71(±0.02) mL of 0.01963(±0.0032) M Ba(OH)2 to reach an end point with bromocresol green indicator. ? of HCL = 29.71?? ? 0.01963 ???? ??(??)2 ?? ? 2 ???? ??? ???? ??(??)2/ 50.00?? = 0.02333 ? Calculate the uncertainty of the result (absolute error).Calculate the coefficient of variation for the result.What is the Ksp expression for PbCl2 in water? Group of answer choices Ksp = [Pb2+][Cl–]2 Ksp = [Pb2+][Cl–] Ksp = [??2+][??−]2[????2][Pb2+][Cl−]2[PbCl2] Ksp = [??2+][??−][????2][?2?][Pb2+][Cl−][PbCl2][H2O]15. A 300.00 mL solution of 0.00165 M A2B5 is added to a 230.00 mL solution of 0.00380 M C2D3. What is pQsp for A2D5?
- ANSWER THE FOLLOWING WITH A COMPLETE SOLUTION. Compute for the pKa of benzoic acid (Ka = 6.3 × 10-5). What is the Kb of ammonia if its pKb is 4.75? What is the [OH-] of a solution if its pH is 5.69? Identify the [H+] of a solution with a pOH of 11.41. Identify if it is neutral, acidic or basic. What is the pH of a buffer prepared with 0.51 M disodium phosphate and 1.1 M sodium acid phosphate? (pKa of sodium acid phosphate = 7.21) Compute the pH of a buffer containing 0.62 M boric acid (Ka = 5.90 × 10-10) and 0.45 M sodium borate.In the spectrofluorometric analysis of quinine, which of the following statements/phrases can be considered a factor level? A. concentration of 2ppm of iodide B. concentration of quenchers C. use of quenchers D. use of iodidePhenolphthalein has a pKa of 9.7 and is colorless in its acid form and pink in its basic form. For pH= 7.7 calculate [In−]/[HIn]. Express your answer using two significant figures.
- Nitrous acid has a Ka of 4.5×10-4. a.) What is the pH of a buffer solution containing 0.13 M HNO2 and 0.15 M NO2- ? Express your answer using two decimal places.The value of Ksp for Mg3(AsO4)2 is 2.1 x 10-20. TheAsO43 - ion is derived from the weak acid H3AsO4 (pKa1 =2.22; pKa2 = 6.98; pKa3 = 11.50). (a) Calculate the molarsolubility of Mg3(AsO4)2 in water. (b) Calculate the pH of asaturated solution of Mg3(AsO4)2 in water.Data Table 2: Complexometric Titration of Tap Water photo shows equation to find water hardness 6 ml of water used (5 ml of tap water 1ml of buffer) Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 2ml 2ml 2ml Final Syringe Reading (mL) .61ml .69ml .58ml Volume of EDTA Consumed (mL) 139ml 131ml 142ml Water Hardness ppm CaCO3 (mg/L) Average ppm CaCO3 (mg/L):