Consider the titration of 100.0 mL of 0.42 M H3A by 0.42 M KOH for the next three questions. The triprotic acid has Ka1 = 1.0 x 10-4, Ka2 = 1.0 x 10-7, and an unknown value for Ka3. All answers to 3 significant digits.
1) Calculate the pH after 100.0 mL of KOH has been added.
pH =
2) Calculate the pH after 150.0 mL of KOH has been added.
pH =
3) The pH of the solution after 200.0 mL of KOH has been added is 9.00. Determine the value of Ka3 for this triprotic acid. Use scientific notation to enter this answer, e.g., 1.0 x 10-3 = 1.0E-3.
Ka3 =
In: Chemistry
2. A. Find the five-number summary for the Tar content of the sample of cigarettes. List the values. Draw a boxplot to illustrate this. Be sure to show an evenly marked scale below it. Use a ruler to draw the figure. Comment on its shape, i.e. does it appear to be skewed left, skewed right, or symmetrical? B. Compute the IQR, UF, and LF for the Tar content of the sample of cigarettes. Does the data have any outliers? If so, list them. C. State the mode(s) of the tar content. D. Compute the range of the tar content.
Cigarette Data (all quantities are in mg per cigarette)
|
Brand |
Nicotine |
Tar |
Carbon Monoxide |
|
American Filter |
16 |
1.2 |
15 |
|
Benson and Hedges |
16 |
1.2 |
15 |
|
Camel |
16 |
1.0 |
17 |
|
Capri |
9 |
0.8 |
6 |
|
Carlton |
1 |
0.1 |
1 |
|
Cartier Vendome |
8 |
0.8 |
8 |
|
Chelsea |
10 |
0.8 |
10 |
|
GPC Approved |
16 |
1.0 |
17 |
|
Hi-Lite |
14 |
1.0 |
13 |
|
Kent |
13 |
2.0 |
13 |
|
Lucky Strike |
13 |
1.1 |
13 |
|
Malibu |
15 |
1.2 |
15 |
|
Marlboro |
16 |
1.2 |
15 |
|
Merit |
9 |
0.7 |
11 |
|
Newport Stripe |
11 |
0.9 |
15 |
|
Now |
2 |
0.2 |
3 |
|
Old Gold |
18 |
1.4 |
18 |
|
Pall Mall |
15 |
1.2 |
15 |
|
Players |
13 |
1.1 |
12 |
|
Raleigh |
15 |
1.0 |
16 |
|
Richland |
17 |
1.3 |
16 |
|
Rite |
9 |
0.8 |
10 |
|
Silva Thins |
12 |
1.0 |
10 |
|
Tareyton |
14 |
1.0 |
17 |
|
Triumph |
5 |
0.5 |
7 |
|
True |
6 |
0.6 |
7 |
|
Vantage |
8 |
0.7 |
11 |
|
Viceroy |
18 |
1.4 |
15 |
|
Winston |
16 |
1.1 |
18 |
In: Statistics and Probability
In: Chemistry
| Estimate the mean mpg of all cars with 86% confidence. After collecting a random sample of 26 cars you find a sample mean of 31 miles. Assume the distribution of mpg for all cars is normal with a standard deviation of 1.2 miles. ( Round your answers to two decimal places.) |
| 1. Z table value = |
| 2. Margin of Error = |
| 3: You estimate with 86% confidence that the population mean
falls between the lower value of and the upper value of |
*please show the work
In: Statistics and Probability
| Estimate the mean mpg of all cars with 86% confidence. After collecting a random sample of 26 cars you find a sample mean of 31 miles. Assume the distribution of mpg for all cars is normal with a standard deviation of 1.2 miles. ( Round your answers to two decimal places.) |
| 1. Z table value = |
| 2. Margin of Error = |
| 3: You estimate with 86% confidence that the population mean
falls between the lower value of and the upper value of |
*please show the work
In: Statistics and Probability
A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It has 11-ft lanes, 4-ft shoulders, and there are 3 ramps within 3 miles upstream of the segment midpoint and 4 ramps within 3 miles downstream of the segment midpoint. The freeway is on rolling terrain and has 8% heavy vehicles with a peak-hour factor of 0.85. It is know that 12% of the AADT occurs in the peak hour and that the directional factor is 0.6. What is the freeway’s AADT?
In: Civil Engineering
Suppose the speeds of people driving from Dallas to Houston normally distributed, with a mean average speed of 92 miles per hour. (a) If the probability that the speed is more than 108 mph is 0.8%, what is the standard deviation? (6 points) (b) Given the standard deviation in (a), what is the probability that a person drove less than 85 miles per hour? (5 points) (c) If Ben drove at a speed that exceeds 85% of all other people. What was her speed? (6 points)
In: Statistics and Probability
Featured below are data on fuel economy (in miles/gallon) for a random sample of 12 mid-size cars.
X: {25.8, 20.2, 28.7, 24.6, 19.5, 33.1, 30.5, 27.7, 28.4, 30.9, 22.3, 24.2}
Construct a 95% confidence interval for the true mean fuel economy
Conduct a test to determine whether the true mean is higher than 25.0 miles/ gallon.
The null and alternative hypothesis
The test statistic
The p-value of the test,
Your decision and the interpretation in the context of the problem.
In: Statistics and Probability
Two cars start driving from the same point. One travels north at
30 miles per hour, and the other travels east at 45 miles per hour.
At what rate is the distance between the cars increasing two hours
later?
(a) Draw a diagram, label quantities.
(b) Write rates as derivatives.
(c) Find an equation involving the quantities; differentiate on both
sides with respect to t.
(d) Plug in known information and solve for the unknown. [As usual,
numeric simplification not required.]
In: Math
1. Suppose two automobiles leave from the same point at the same time. If one travels north at 60 miles per hour and the other travels east at 45 miles per hour, how fast will the distance between them be changing after 3 hours?
2. Find the critical values of , find the intervals on which f(x)is increasing and decreasing, and any local maximum or minimum values.
Critical values?
Increasing on?
Decreasing on?
Max?
Min?
Please show all work.
In: Math