10-11. BaSO, is precipitated from a solution of NazSO4 by slow addition of Ba(NO3)2. Which ion will constitute the primary adsorption layer? A. Na+ B. SO,2- С. Ва2 D. NO, Which ion will constitute the counter ion layer? B. SO,2- A. Na+ С. Ва?+ D. NO3
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- The Ksp of Al(OH)3 (MM: 78) is 1.90 xx 10^(-33). a) What is the solubility of Al(OH)3 in g/L?4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution of 10ml stock solution to 100ml volumetric flask X=0.98 (intensity)Which of these types of coprecipitation happens with greater probability when the ratio of the contaminant concentration to the analyte concentration is too high? Mechanical entrapment Mixed crystal formation Surface adsorption Occlusion
- Which of the following is a possible surface contaminant that can be carried through surface adsorption during precipitation of zinc hydroxide? Select one: NiCO3 (Ksp = 1.3 × 10-7) CaC2O4 (Ksp = 1.7 × 10-9) BaCO3 (Ksp = 5.0 × 10-9) Ba(NO3)2 (Ksp = 4.64 × 10−3)Qmax is maximum adsorption of acetic acid on activated carbon.If there is another organic compound that has high affinity to activated carbon in the same acetic acid solutions. How Qmax of acetic acid adsorption will change?Lower, Higher or same? EXPLAINDescribe how the adsorption isotherm is used in chromatography.
- Adsorption of 0.5 M 100 ml of acetic acid solution on 1 g of activated carbon is taking place. After the adsorption process, the non-adsorbed acetic acid is filtered. Take the filtrate into a 10 ml flask and titrate with 0.1 M NaOH to find the equilibrium concentration. is done. The amount of NaOH consumed in the titration per 10 ml of acetic acid solution 42 ml. Find the adsorption capacity of the adsorbent.Optimum cell concertation is very important for successful bone marrow culture. A technologist received 2.7 ml bone marrow specimen with concentration 20 x 10^6 cell/ml, she add 1ml this bone marrow to 9 ml Marrow-Max culture medium to set up a bone marrow culture. What is final cell concentration in this bone marrow culture?Collodial silver, prescribed by some medical professionals for colds and flu, is a dispersion of elemental silver particles with an average particle size distribution of 20-40 nm. Silverlab Collodial Silver Liquid 200ml (DisChem) contains 100 ppm Ag(0). 6.1 Determine the molarity of Ag(0) in thisdispersion. 6.2 If it was possible to filter the Ag(0) from the dispersion with nano-filtration technology, how many of these bottles should be filtered to obtain 10 g silver?
- You are given a container with Na3PO3 that is reportedly contaminated. You are asked by your supervisor to determine the percent purity of that sample in order to know the next measures to be taken by the plant. The following are the procedures that you need to do: a. Dissolve sample weighing 1 g in 35 mL water. b. Prepare solution with 45 mL 3% w/v HgCl2, 30 mL 10% w/v C2H3NaO2 and 10 mL CH3COOH. c. Digest sample then filter then rinse the precipitate that weighs 0.2857 g. d. Compute for the % purity.For N2 adsorbed on activated carbon at –77 °C, the following values of adsorbed gas (per gram of adsorbent) were obtained at different pressures: P/atm 3.5 10.0 16.7 25.7 33.5 39.2 v/(cm³/g) 101 136 153 162 165 166 - Estimate the volume value of the monolayer. - Calculate the coating fraction (θ) at a pressure of 10 atm. ANSWER: 0.82 - What would happen (increase / decrease) with the coating fraction at 10 atm if the temperature increased? - What would happen to the volume of the monolayer if the temperature increased? - Using the Langmuir isotherm, estimate the value of the adsorption equilibrium constant. Tip: use the overlay fraction at 10 atm (already calculated in item b) and calculate the value of K. ANSWER: 0.45Which of these types of coprecipitation happens with greater probability when the particle sizes of the precipitate are small? Surface adsorption Occlusion Mixed crystal formation Mechanical entrapment