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Potassium iodate(V) is a primary standard. It reacts with iodide ions in the presence of acid to form iodine. a standard solution of iodine can be prepared by weighing out the necessary quantity of potassium iodate(V) and making up to a known volume of solution. When a portion of this solution is added to an excess of potassium iodide in acid, a calculated amount of iodine is liberated.
1.015g of potassium iodate(V) are dissolved and made up to 250cm^3. To a 25.0cm^3 portion are added an excess of potassium iodide and dilute sulphuric acid. The solution is titrated with a solution of sodium thiosulphate, starch solution being added near the endpoint. 29.8cm^3 of thiosulphate are required. Calculate the concentration of the thiosulphate solution.Note: 2S2O3(aq) + I2(aq) = 2I^-(aq) + S4O6^2-(aq)
Dry ice (solid CO2 ) has occasionally been used as an "explosive" in mining. A hole is drilled, dry ice and a small amount of gunpowder are placed in the hole, a fuse is added, and the hole is plugged.
Calculate an approximate delta_h in kilojoules for the industrial synthesis of ethyl alcohol from ethylene: C2H4(g) + H2O(g) -> C2H5OH
What is the theoretical yield (in mg) of sodium bisulfite adduct of cyclohexanone, assuming that you convert all the starting material to it
What is the vapor pressure of SiCl4 in mm \ Hg at 31.5 C? The vapor pressure of SiCl4}is 100 mm \ Hg at 5.4 C, and Delta H vap} = 30. kJ/mol
How are vapor pressure and boiling point of a liquid related to each other? What does intermolecular attraction have to do with either
making ice cream involves surrounding the ice cream canister with a bath of salted ice water. to get the mix to freeze
One liter of an acetate buffer is prepared by adding 60mL of 1.5M acetic acid and 50mL of 0.4M sodum acetate. Calculate the final concentrations of acetic acid and acetate
Volume after mixing is 131mL. Kf=1.86 C/m -- Kb=0.512 C/m Calculate the freezing point and boiling point?
The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 mol of NaC2H3O2 in enough water to make 1.50 L of solution.
What percentage of total HF molecules are in each of the first 6 rotational levels (J = 0-5) at 25oC ? Howmany levels (values of J) are required to account for 99% of all HF molecules at this temperature
Element X has two natural isotopes: X-6 (6.015 amu) and X-7 (7.016 amu). Calculate the atomic mass of the element X given the abundance of X-7 is 92.5%
Use the standard reduction potentials to find the equilibrium constant for the following reaction at 25 degree Celcius:
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