52.6 mL of 0.1049 M methylamine (CH,NH2) is titrated with 0.0502 M HI. Determine the pH of the titrated solution after 32.4 mL HI has been added. The base-dissociation constant for methylamine at 25°C is 4.6 × 10-4. ×

1. An impure sample of compound A is contaminated with two impurities B and C. The sample is to be purified by recrystallization using ethanol as the solvent. The solubility properties of the three components are summarized below. Solubility in Solubility in ethanol Solubility in 50 mL Solubility in 50 mL ethanol at -78 °C at - 0°C ethanol at -78 °C ethanol at - 0°C (g) (g) Compound A 0.12 g/mL 0.02 g/mL Impurity B 0.58 g/mL 0.04 g/mL Impurity C 0.005 g/mL 0.0003 g/mL The impure (7.5 g) sample contains 5.0 g of compound A, 1.5 g of B and 1.0 g of C and is recrystallized using 50 mL of ethanol. The sample is boiled with 50 mL of ethanol, filtered by gravity and then cooled in ice and filtered by suction. a) How much compound A should be obtained as the final product? Will the sample be contaminated with any of the impurities? Explain (using calculations to support your answer-fill in the missing masses in the table above). Hint: For this question you should calculate the mass of each…

At a particular temperature, the solubility of In₂(SO₄)₃ in water is 0.0077 M. If solid In₂(SO₄)₃ is added to a solution that already contains 0.150 M In(NO₃)₃, what will the new solubility of the solid be?     ____M

The dissolution of ammonium nitrate is given by the reaction: NH,NO,(s) → NH (ag) + NO, (aq)

ABS plastic is a polymer consisting of three monomer units: acrylonitrile (C₃H₃N), butadiene (C₄H₆), and styrene (C₈H₈). A sample of ABS plastic contains 12.9% N by mass. It took 1.56 g of Br₂ to react completely with a 2.00 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene units in the polymer and nothing else, so bromination is a method for determining the quantity of butadiene in the polymer. What is the percent by mass of styrene in the polymer?

Choose four ways in which the yield of ammonia in the reaction below can be improved for a given amount of H2. N2 (g) + 3H2 (g) ---- 2NH3 (g), deltaH<0 (Select all that apply.) decreasing the nitrogen or hydrogen concentration increasing the temperature increasing the total pressure on the mixture removing the gaseous  or  from the equilibrium by liquefying removing the gaseous  from the equilibrium by liquefying it decreasing the total pressure on the mixture lowering the temperature increasing the nitrogen concentration

To no one's surprise, the only one who's been getting burned is Wile E. Coyote. Good thing he has a few ACME brand instant cold packs! These cold packs contain ammonium nitrate and water, separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH,NO3(s) → NH,+(ag) + NO3 (ag) As Wile E. Coyote ices his wounds and plans his next move, he wants to measure the enthalpy change for this reaction (maybe he's smarter than he seems!). 1.05 g of NH,N03 is dissolved in enough water to make a solution with a mass of 27.0 g. The initial temperature is 26.3 °C and the final temperature (after the solid dissolves) is 20.7 ° C. Part A Based on the information given, what is the total heat (gryn) associated with the dissolution of the NH,NO3 ? You may assume that the solution that forms has a heat capacity equivalent to water, 4.184 J. g 1.º C-1 Express your answer to two significant figures. qrxn = J

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1. Ethanol forms a nearly ideal solution with iso-butanol. The vapour-liquid equilibrium data is given below in terms of the more volatile component (ethanol).A heated feed containing 60mole % ethanol enters a flash drum at a rate of 50 kmol/h and equilibrium separation is achieved. What fraction of the feed to be vaporized to have a bottom product containing not more than 50% ethanol. 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 y* 0.196429 0.354839 0.485294 0.594595 0.6875 0.767442 0.836957 0.897959 0.951923 1

15.00 ml of a 0.3400 m manganese(iii) acetate solution is mixed with 25.00 ml of a 0.2311 m ammonium carbonate solution. Calculate the number of grams of solid precipitate produced. Calculate the molarity of all species in solution after the reaction has taken place.