1) A 17.0 mL sample of a 0.446 M aqueous hydrofluoric acid solution is titrated with a 0.314 M aqueous sodium hydroxide solution. What is the pH at the start of the titration, before any sodium hydroxide has been added?
2)When a 24.4 mL sample of a 0.304 M aqueous acetic acid solution is titrated with a 0.445 M aqueous potassium hydroxide solution, what is the pH after 25.0 mL of potassium hydroxide have been added?
In: Chemistry
write a paragraph addressing question below and create a basic graph describing
Suppose that the U.S. government increases the legal minimum wage. Assume that most of the workers employed in the production of coffee are paid the legal minimum wage rate.
Will this affect the supply or the demand for coffee? Why?
Which determinant of demand or supply is being affected?
Create a graph with before- and after-curves on the same axes.
How will this change the equilibrium price and quantity of coffee, assuming all else remains unchanged? Explain your reasoning.
In: Economics
1). A 27.1 mL sample of 0.342 M trimethylamine, (CH3)3N, is titrated with 0.336 M hydrochloric acid. The pH before the addition of any hydrochloric acid is _____
2). A 20.8 mL sample of 0.305
M dimethylamine,
(CH3)2NH, is titrated with
0.255 M hydroiodic acid.
At the equivalence point, the pH is ______
3). A 26.2 mL sample of 0.251
M diethylamine,
(C2H5)2NH, is
titrated with 0.215 M hydrobromic
acid.
After adding 42.8 mL of hydrobromic
acid, the pH is _____
In: Chemistry
A police car sounding a siren with a frequency of 1550 Hz is traveling at 130 km/h .
What frequencies does an observer standing next to the road hear as the car approaches? As it recedes?
What frequencies are heard in a car traveling at 90.0 km/h in the opposite direction before and after passing the police car? For both approaching and receding
The police car passes a car traveling in the same direction at 80.0 km/h. What two frequencies are heard in this car? For both approaching and receding
In: Physics
A steam thermoelectric plant operates a Rankine cycle with overheating. Water enters the pump as saturated liquid , 7.7 kg/s. The efficiency of the pump is 0.9 The water enters the high pression turbine at 12 500 kPa and 550°C, after that steam overheats at a constant pressure of 2000 kPa until 450°C before it expands on the low pressure turbine. The efficiency of both turbines is 0.85. The vapor quality when it enters to the condenser is 0.95 Determine the thermal efficiency of the cycle.
In: Mechanical Engineering
A graduated cylinder is filled to the 40.00−mL mark with a mineral oil. The masses of the cylinder before and after the addition of the mineral oil are 124.966 g and 159.446 g, respectively. In a separate experiment, a metal ball bearing of mass 21.867 g is placed in the cylinder and the cylinder is again filled to the 40.00−mL mark with the mineral oil. The combined mass of the ball bearing and mineral oil is 50.952 g. Calculate the density and radius of the ball bearing (volume of a sphere of radius r is 4/3πr3).
In: Chemistry
A graduated cylinder is filled to the 40.00−mL mark with a mineral oil. The masses of the cylinder before and after the addition of the mineral oil are 124.966 g and 159.446 g, respectively. In a separate experiment, a metal ball bearing of mass 21.867 g is placed in the cylinder and the cylinder is again filled to the 40.00−mL mark with the mineral oil. The combined mass of the ball bearing and mineral oil is 50.952 g. Calculate the density and radius of the ball bearing (volume of a sphere of radius r is 4/3πr3).
In: Chemistry
Marcal can wait for 1 year and find out whether the cash flows will be $50 million per year or $90 million per year before deciding to purchase the company. If it waits to purchase, Marcal can no longer sell the company for $450 million 2 years after purchase. Does decision-tree analysis indicate that it makes sense to purchase the electronics company? If so, when? Again, assume that all cash flows are discounted at 15%. (NPV calculation required)
In: Accounting
1. how does age affect elimination problems
2. What is the difference between an indwelling catheter and a straight catheter?What are some reasons why a patient would need an indwelling catheter inserted?What are some reasons why a patient would need a straight catheter?What education should be given to the patient before, during, and after the procedure?How did you do while practicing? Did you forget anything? Did you stay sterile?
In: Nursing
To buy a $160,000house, you take out a 6% (APR compounded monthly) mortgage for $130,000. Five years later, you sell the house for $195,000 (after all other selling expenses). What equity (the amount that you can keep before tax) would you realize with a 30-year repayment term? Note: For tax purpose, do not consider the time value of money on $30,000 down payment made five years ago.
The realized equity will be $____ thousand?
In: Economics