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Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places. Enter scientific notation as 1.23E4. (a) When 11.50 mL of 0.470 M HNO3 have been added. (b) When 65.00 mL of 0.470 M HNO3 have been added.
Consider the autodissociation of water as the behavior of an Arrhenius acid. Use this to explain the temperature dependence of the autoionization of water and use it to explain
Calculate the new freezing point for a 0.61 m solution of CCl4 in benzene. 2) Calculate the increase in the boiling point, Î"T, for a 1.94 m solution of sucrose (dissolves as a molecule) in water
Calculate the equilibrium constant at 0c and at 50c(assuming enthalpies of formation are independent of temp)
Suppose a volume is divided into three equal parts. How many microstates exist for distributing four molecules among the three parts?
write the rate law for each elementary reaction in the mechanism. D) if the first step is slow and the second one is fast, what rate law do you expect to be observed for the overall reaction.
When aluminum is produced by electrolysis we get 5.68 tons of aluminum and 5.04 tons of oxygen. What is the empirical formula of the compound that is being electrolyzed
Lindane is a toxic insecticide that causes dizziness and diarrhea in humans. Find the molecular formula for lindane given its percent composition:
Equal masses of water and ethylene glycol are mixed. What is the concentration of ethylene glycol in units of molality? The molar mass of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively.
To find the pKa of X-281, you prepare a 0.087M test solution of X-281. The pH of the solution is determined to be 2.40. What is the pKa of X-281?
which the excess HClO4 was back-titrated with 8.72-mL of 0.3045 M NaOH using bromocresol green as an indicator. What is the concentration of the perchloric acid solution?
An unknown mass of each of the following substances, initially at 22.0^circ C, absorbs 1950 J of heat. The final temperature is recorded as indicated. Find the mass of each substance. a. Pyrex glass (T_f=55.1^circ C. B.sand (T_f=62.3^circ C). C.et..
Calculate the pH of a solution that results from mixing 19.5 mL of 0.145 M HCN(aq) with 22.1 mL of 0.108 M NaCN. The Ka value for HCN is 4.9 x 10-10.
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