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- What volume of a 0.186 molL−1 Na3PO4 solution is necessary to completely react with 91.9 mL of 0.103 molL−1 CuCl2?v9. How you would prepare a 1:25 dilution (v/v) of the solution prepared above?a) What mass of Fe(NH4)2(SO4)2•2H2O(s) is required to prepare a 500 mL solution containing 100 ppm (m:v) in Fe? b) Using this stock solution, what aliquot must be used to prepare calibration solutions, 100 mL volume, of the following concentrations: 0.100 ppm, 0.500 ppm, 2.00 ppm, 4.00 ppm, and 7.00 ppm.
- The Henry’s law constant for CO2 in water at 25 °C is3.1x 10-2 M atm-1. (a) What is the solubility of CO2 inwater at this temperature if the solution is in contact withair at normal atmospheric pressure? (b) Assume that all ofthis CO2 is in the form of H2CO3 produced by the reactionbetween CO2 and H2O:CO2(aq) + H2O(l)------>H2CO3(aq)What is the pH of this solution?How many ml of a sodium hydroxide solution with a concentration of 40g/100cm3 should be measured out to prepare 200cm3 of 0.5M solution?How many grams of CaF2 (molar mass = 78.077) will dissolve in 650 mL of 0.15 M NaF solution? The Ksp for CaF2 is 3.8904e-11.
- Describe preparation of 400. mL of a solution that is 0.0500 M in I2, starting with solid MgI2.What mass of solid Lanthanum (III) oxalate nonahydrate { La2 ( C2O4 )3 ∙ 9 H2O } can be obtained from 650 mL of 0.0170 M aqueous solution of LaCl3 by adding a stoichiometric amount of sodium oxalate ? with solution/explanationThe Henry’s law constant (kH) for O₂ in water at 20°C is 1.28X10⁻³mol/Latm. (a) How many grams of O₂ will dissolvein 2.50 L of H₂O that is in contact with pure O₂ at 1.00 atm? (b) How many grams of O₂ will dissolve in 2.50 L of H₂O that isin contact with air, where the partial pressure of O₂ is 0.209 atm?
- A 600.0 mg sample consisting of only CaC2O4and Mg C2O4is heated at 500oC converting the two salts to CaCO3and MgCO3. The sample weighs 465.0 mg. If the sample had been heated at 900oC where the products are CaO and MgO, what would the mixture of oxides weigh? Show the clear and complete solutionWhat volume of water should be added to 100.0 mL of a 0.500 N Cr2(SO4)3·18H2O solution to obtain a final concentration of 0.075 M? Show step-by-step solution.Describe the solution's preparation: i) 250 mL of 0.0750 M AgNO3 from the solidreagent ii) 500 mL of 4.75 % (w/v) aqueous ethanol iii) 250 mL solution of 25 ppm of Na+ from solid sodium sulfate (Na2SO4)