A solution of Na3AsO4 is added dropwise to a solution that is 0.0411 M in Bi3+ and 2.66e-08 M in Cd2+. The Ksp of BiAsO4 is 4.43e-10. The Ksp of Cd3(AsO4)2 is 2.2e-33. (a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.) [AsO43-] = M. (b) Which
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A solution of Na3AsO4 is added dropwise to a solution that is 0.0411 M in Bi3+ and 2.66e-08 M in Cd2+.
The Ksp of BiAsO4 is 4.43e-10.
The Ksp of Cd3(AsO4)2 is 2.2e-33.
(a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.)
[AsO43-] = M.
(b) Which cation precipitates first?
Bi3+Cd2+
(c) What is the concentration of AsO43- when the second cation begins to precipitate?
[AsO43-] = M.
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- In an experiment to determine the concentration of H2SO4 in a brand of toilet cleanser, 10.0 cm3 of the cleanser was first diluted to 250.0 cm3 with distilled water. 25.0 cm3 of the diluted cleanser were titrated with 0.320 mol dm–3 NaOH solution, using methyl orange as indicator.If 29.2 cm3 of NaOH solution is used, what is the concentration of H2SO4 in the undiluted toilet cleanser?a. 2.30 mol dm–3b. 4.60 mol dm–3 c. 9.20 mol dm–3 d. 11.50 mol dm–3Ammonium acetate buffer is used as an important reagent for studying molecular biology, biological buffers, reagents and DNA and RNA purification. Ammonium acetate (0.24M) in combination with cold 66% (v/v) ethanol quantitatively precipitated RNA from very dilute solutions (greater than or equal to μg/ml) after centrifugation. Ammonium acetate (CH3COONH4) is also a salt of weak acid (CH3COOH) and weak base (NH4OH). The Ka and Kb are equal to 1.8 x10-5. The pH of this salt solution will be, a. pH > 7 b. pH ≈ 7 c. pH < 7 d. both cation and anion don’t hydrolyze. e. none of the above.CrO42- can be used as an indicator when Br- is titrated with Ag+. What concentration of CrO42- should be used so that Ag2CrO4(s) just starts to form at the equivalence point? If a concentration of 0.0010 M CrO42- is used instead, at what concentration of Br- will Ag2CrO(s) just start to precipitate? Do you think this is likely to introduce significant error? The Ksp for Ag2CrO4(s) is 1.2x10-12.
- A solution of Na3AsO4 is added dropwise to a solution that is 0.0347 M in Cu2+ and 0.000309 M in Ag+.The Ksp of Cu3(AsO4)2 is 7.95e-36.The Ksp of Ag3AsO4 is 1.03e-22.(a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.)[AsO43-] = __________ M.(b) What is the concentration of AsO43- when the second cation begins to precipitate?[AsO43-] = _______ M.What is the maximum solid solubility of Mg in Al? At what temperature does it occur? e. An Al-Mg alloy (10 wt% Mg, 90 wt% Al) is heated slowly (to insure equilibrium) from a temperature of 200 C: i. At what temperature does the first liquid phase form? ii. What is the composition of the liquid phase at the temperature in part i.? iii. At what temperature does complete melting (no solid phase remaining) occur? iv. What is the composition of the last solid remaining prior to complete melting? f. Using the equilibrium phase diagram of Figure 1, identify the phases present, their compositions, and their relative mass fractions at equilibrium for a 70 wt% Mg – 30 wt% Al alloy held at 300 C.Using an experimentally determined value (2.4×10−10) of Ksp, determine the value for the reaction quotient 'Q' if Ag2CrO4 will precipitate when 7.00 mL of 0.0040 M AgNO3 are added to 4.00 mL of 0.0024 M K2CrO4.
- The value of Ksp of AgCl is 1.8 x 10-10. What would be the molar concentration of Ag+ and Cl-in AgCl in pure water placed in contact with solid AgCl(s)?1ml of 1mg/ml of diluted aspirin powder solution is titrated by 0.005M NaOH. Before titration, 5 ml ethanol, 14 ml CO2 free water, and 4 drops bromothymol blue indicator is added into diluted aspirin powder solution. Mass of 0.005M NaOH used is obtained by weight titration = 1.1384g . [Molar mass of aspirin =180.15]; for solution, 1g=1mL at 25 degree Celcius. Calculate the purity of the powder.The compound lead(II) sulfate has a solubility of 4.824E-3 g/100mL at 25 degC.What is the molar solubility of this solution at saturation? 0.0002 mol/L What is the Ksp at 25 degC for lead(II) sulfate? What is the molar solubility of lead(II) sulfate in 0.28 M lead(II) nitrate ?
- 0.1 g of the mixture of na2so4 and k2so4 is taken and 100 ml of solution is prepared. 10 ml of this prepared solution is placed in a beaker and some distilled water is added. A mass of 15.5 mg is obtained by precipitation with Bacl2 at PH=5, then filtering and bringing to a constant weight at 800 °C. Calculate the percentages of Na2so4 and K2so4 in the mixture accordingly.A solution of Na2C2O4 is added dropwise to a solution that is 0.0339 M in Cd2+ and 0.359 M in Ag+.The Ksp of CdC2O4 is 1.42e-08.The Ksp of Ag2C2O4 is 5.4e-12.(a) What concentration of C2O42- is necessary to begin precipitation? (Neglect volume changes.)[C2O42-] =_____ M.(b) Which cation precipitates first? ____Cd2 ____Ag+ (c) What is the concentration of C2O42- when the second cation begins to precipitate?[C2O42-] =________ M.A solution of Na3AsO4 is added dropwise to a solution that is 0.0576 M in Cu2+ and 0.000398 M in Ag+.The Ksp of Cu3(AsO4)2 is 7.95e-36.The Ksp of Ag3AsO4 is 1.03e-22.(a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.)[AsO43-] = ______M.(b) Which cation precipitates first? Cu2+Ag+ (c) What is the concentration of AsO43- when the second cation begins to precipitate?[AsO43-] = _____M.