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- Write the balance equation of aqueous Pb(ClO3)2 with NaI. Include phases.The solubility of borax, which is made up of sodium tetraborate (Na2B4O5(OH)4 8H2O), was analyzed. The dissolution of borax is: Na2B4O5(OH)4 • 8H2O(s) ⇌ 2 Na+(aq) + B4O5(OH)42–(aq) + 8 H2O(l) A 50 mL saturated solution was prepared. After filtration of solution, 5 mL aliquot was transferred to a flask and titrated using 0.432 M HCl. The endpoint was found to be 4.73 mL of the titrant. Tetraborate anion (B4O5(OH)42-) is a weak base which reacts with HCl like the following reaction: B4O5(OH)42–(aq) + 2 H+(aq) + 3 H2O(l) ⇌ 4 H3BO3(aq) What is Ksp expression for the dissolution? What is the tetraborate ions concentration in the filtrate? What is the molar solubility and Ksp of borax if the titration was done at room temperature (298 K)?. At 250C, Ksp for AgBr is 5.0 x 10-13. Calculate the solubility of AgBr in g/L at 25 oC (a) in pure water; (b) In the presence of 0.2 mol L−1 NaBr solution
- What mass (in grams) of Na2S2O3 is needed to dissolve 0.44 g of AgBr in a solution volume of 1.0 L, given that Ksp for AgBr is 3.3×10−13 and Kf for [Ag(S2O3)2]3− is 4.7×1013?The hardness of water (hardness count) is usually expressed in parts per million (by mass) of CaCO3. What is the molar concentration of Ca2+ ions in a water sample with a hardness count of 175mg CaCO3il? How many milliliters of concentrated sulfuric acid, 94.0% (w/w), specific gravity of 1.831 are required to prepare 1 liter of a 0.100 M solution? The solubility-product constant for Ce(IO3)3 is 3.2x1010. What is the Ce3+ concentration in a solution prepared by mixing 50.0 ml of 0.0250 M Ce3.. with 50.00 ml of water?Explain how you would analyse Fe(OX).2H2O for iron and oxalate if you were provided with a standardised solution of potassium permanganate, dilute sulphuric acid and zinc dust.
- The fat in a 1.821 g sample of potato chips is extracted with supercritical CO2. After extraction, the residue weighs 1.139 g. What is the fat content (% w/w) of the potato chips?The progress of the reaction between Iodine ions and potassium iodate(V) can be followed by withstanding samples of the reaction mixture at various times, quenching and then titrating with standard thiosulphate solution. The reaction equation is: I(aq) + IO3(aq) + 6H+(aq) + 4e ➡ I2(aq) + 3H2O(l) What other method could be used to follow up this reaction? How could you quench the reaction?How many grams of cadmium are deposited from an aqueous solution of cadmium sulfate, CdSO4 when an electric current of 1,51A flows via the solution for 221 min?
- 4. a. Describe the preparation of 1.67 L of 5.00% (w/v) K2Cr2O7 from the solid salt. b. What is the ppm K2CR2O7 in the above solution?Calculate the solubility (in g/L) of Aluminum sulfide (Al2S3) In 0.25 M Al+3 solution. (standard conditions.) {Ksp for Al2S3 is 1.5×10-27}.As a result of breakdown of the Ventilation system, the gaseous product of the reaction of 2 kg Of phosphorus with excess of concentrated nitric acid got into the room with people( The color of polluting gas is reddish-Brown, write the balance mentioned reaction. ) The volume of room is 8000 m^3. The maximum permissible concentration of the gaseous reaction product is 2 mg/m^3. Is it dangerous for the group of 4 people to be in this room?
