3 A student has a household chemical with a pH of 9, what will happen if he puts phenolphthalein in this solution. Give reason for your answer. 了了
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Q: Ph a b доби 24 Ph Ph 25 27 CI ОН НО CI 26 28
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- a poorly soluble salt MX has Ksp=10^-10. if a solution has [M+(aq)] is 1M, what is the maximum value of [X-(aq)]?Methodolody: (Include a short summary of the overall experimental plan you are going to run. You may use flow chart or bullet form for this part. Sketches of any experimental set-ups used in the experiment or the workup procedures). Preparation of buffers Prepare 250ml of the following buffer solutions. Concentration Buffer solution pka Desired ph 0.50 M Phosphate 2.12 3.0Which of these compounds would be the best buffer at pH 5.0: formic acid (pKa = 3.8), acetic acid (pKa = 4.76), or ethylamine (pKa = 9.0)? Briefly justify your answer.
- Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,Tom suspected that he might have received regular coffee and therefore decided to analyze hiscoffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water tomake a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,1oz= 28.35 mL).(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format asaverage ± standard deviation. (Note this is not the concentration in the diluted solution.)(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom wasgiven the wrong type of coffee?(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority ofthe adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake withinthis known safe…The measured pH of a 0.100 M solution of triethylamine (NEt3) is 11.68. What pKa of triethylammonium (HNEt3+) is implied by this data? Enter your response to the nearest 0.01.15. These are samples of about the same size that are carried through an analysis in exactly the same way.A. TitrateB. AnalyteC. ReplicatesD. Distillate
- Note the following indicators and their endpoints: Thymolphthalein (9.9) Resazurin (5.1) Phenol Red (7.4) Which indicator would be most appropriate to use for this lab if phenolphthalein was not available? Discuss the endpoint and equivalence point in your answer.Explain qualitatively how you would prepare a buffer of phosphoric acid at a pH of 7. For phosphoric acid, pKa12.15, pKa27.20 and pKa3 12.15. Then, using Le Chatelier principle and the appropriate equilibrium, explain how the buffer will react to the addition of a small amount of base and a small amount of acidTo carry out your work in the laboratory you need 150 ml of TBE buffer. How Is the solution prepared with the use of 10X TBE and ultrapure water?
- 13. How would you set up a buffer pH/pKa problem and solve the following...Calculate the pH of two HCl solution based on their concentrations of 0.001 and0.0001 M. Then calculate the pH of a solution when you add each of these to a closed carbonicacid system with mcarb-t = mH2CO3 + mHCO3- + mCO32- = 0.01 m and pH = 6. At that pH, mH2CO3 =10-2.16; mHCO3- =10-2.51; mCO32- is negligible.In following these steps . Complete the table and provide th given chemical reactions in the qualitative analaysis of Group 3 Cations. Procedure 1. Place 20 drops of each of the following aqueous solutions to separate centrifuge tubes: 0.1M Cr (NO3)3, 0.1M Al (NO3)3, 0.1M Co (NO3)2, 0.1M Zn (NO3)2, 0.1M Mn (OH)2, 0.1M Ni (NO3)2, 0.1 M Fe (NO3)3. Make each solution basic by adding few drops of 6M NH4OH. Confirm using a litmus paper. 2. Add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Place the samples in thecentrifuge machine for 3 mins. After centrifuge record results. Decant the supernatant liquid of all the samples. 3. Add one drop of NH4OH in each centrifuge tubes. Add 20 drops of distilled water in eachcentrifuge tubes. Then add a few drops of 6M HCl in each solution. Place the samples in the water bath for 10 mins. After water bath, centrifuge the samples for 3 mins. 4. After centrifuge, add a few drops of 6M NH4Cl in each sample. Decant the supernatant liquid…