Homework Answers
sum of all the number = 40.05
number of items = 4
mean = total sum / number of items
mean = 40.05/4
mean = 10.0
Answer: 10.0 mL
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A 10-ml pipette delivers 9.99,9.97, 10.01 and 10.08 mL in an experiment. Calculate the mean. 10.01...
You need 100 mL of a 0.00057 M solution for an experiment. You are given 10...
You need 100 mL of a 0.00057 M solution for an experiment. You are given 10 mL of a 5.7 M stock solution. What is the best method to get the final volume and concentration you for trial? -It is not possible to reach that concentration with the info presented. -Use a 1.0 mL volumetric pipette and then dilute with water to 100 mL, then repeat serially until the desired concentration is reached. -Use a graduated cylinder to measure 0.1...
You are using a 10-ml blow-out pipette graduated in 1/10 ml. (Your pipette reads 0 at...
You are using a 10-ml blow-out pipette graduated in 1/10 ml. (Your pipette reads 0 at the highest marking on the stem.) You have sucked up 8.6 ml of liquid and you cannot put any back into the bottle even though you need to measure out only 6.5 ml. At what mark on the pipette is the meniscus of your liquid now located? If you release liquid from your pipette, at t what line should you stop? Draw the pipette...
QUESTION 10 When a p20 pipette is set to 192 (read from top to bottom), the...
QUESTION 10 When a p20 pipette is set to 192 (read from top to bottom), the pipette will deliver: O 192 ul 0.00192 ml 1.92 mL 19.2 ul Click Save and Submit to save and submit. Click Save All Answers to save all answers.
b) In this experiment an aspirin tablet mark with deionized water. Using a pipette into a...
b) In this experiment an aspirin tablet mark with deionized water. Using a pipette into a 100-mL volumetric flask and diluted to t make a 'diluted aspirin solution'. an aspirin tablet was placed in a 250-ml volumetric flask o dissolved in 10 mL of 1.0M NaOH solution, the flask was then 1.0M NaOH solution, the flask was then filled to the nized water. Using a pipette, 5.0 mL of this solution was added mL volumetric flask and diluted to the...
14. A student is practicing their pipetting technique. They pipette 4 different 10.0 mL samples of...
14. A student is practicing their pipetting technique. They pipette 4 different 10.0 mL samples of water into tared flasks. The samples have the following masses: 9.987 g, 9.566 g, 10.023 g and 9.973 g. Calculate both the average and the standard deviation of the mass data. If 10.0 mL of water is expected to have a mass of 9.998 g at 21.0 ∘ C, calculate the percent error associated with the student's pipetting technique. The average is ["9.998 g",...
4. A student calibrates a 25-mL pipette by measuring the volume of the water it can...
4. A student calibrates a 25-mL pipette by measuring the volume of the water it can transfer. The reading data are shown as follows (unit in mL): 24.75, 24.83, 24.87, 24.91, and 25.32 (a) Is there an outlier at the 95% confidence level? (b) Calculate the coefficient of variation based on the results from part (a). (c) Suppose the standard deviation of the liquid volume is 0.04 mL, how many replicate measurements would the student need to get 95% confidence...
Determine the errors of the volumetric devices. a. For each pipette determine the mean volume. You...
Determine the errors of the volumetric devices. a. For each pipette determine the mean volume. You will need to use the CRC, Perry’s Handbook or other reference to obtain the density of water at the lab temperature>>(THE DENSITY OF THE WATER WAS P = 0.9975412 +/- 0.0000001 g/mL (23o C) b. Use the propagation of error method to find the error in volume associated with each device. c. Calculate the percent uncertainty for each device, and percent error. For this...
tically you can open Assignment 1 here 4. A student calibrates a 25-mL pipette by measuring...
tically you can open Assignment 1 here 4. A student calibrates a 25-mL pipette by measuring the volume of the water it can transfer. The reading data are shown as follows (unit in mL): 24.75, 24.83, 24.87, 24.91, and 25.32 (a) Is there an outlier at the 95% confidence level? (b) Calculate the coefficient of variation based on the results from part (a) (c) Suppose the standard deviation of the liquid volume is 0.04 mL, how many replicate measurements would...
b) In this experiment an aspirin ta and dissolved in 10 mL of 1.0M Na mark...
b) In this experiment an aspirin ta and dissolved in 10 mL of 1.0M Na mark with deionized water. Using a into a 100-mL volumetric flask and make a diluted aspirin solution'. ent an aspirin tablet was placed in a 250-ml volumetric flask 10 mL of 1.OM NaOH solution, the flask was then filled to the zed water. Using a pipette, 5.0 mL of this solution was added IL Volumetric flask and diluted to the mark with FeCl solution to...
Question 2 Calculate the two-sided 90% confidence interval for the population mean (mu) given that a...
Question 2 Calculate the two-sided 90% confidence interval for the population mean (mu) given that a sample of size n=13 yields a sample mean of 10.55 and a sample standard deviation of 0.95. Your answer: 10.45 <mu < 10.65 9.93 <mu < 11.17 10.03 <mu < 11.07 O 10.15<mu < 10.95 O 9.93 <mu < 11.17 9.68 <mu < 11.42 O 10.01 <mu < 11.09 10.03 <mu < 11.07 10.19 <mu < 10.91 O 10.08 < mu < 11.02 Clear...
You are using a 10-ml blow-out pipette graduated in 1/10 ml. (Your pipette reads 0 at the highest marking on the stem.) You have sucked up 8.6 ml of liquid and you cannot put any back into the bottle even though you need to measure out only 6.5 ml. At what mark on the pipette is the meniscus of your liquid now located? If you release liquid from your pipette, at t what line should you stop? Draw the pipette...
QUESTION 10 When a p20 pipette is set to 192 (read from top to bottom), the pipette will deliver: O 192 ul 0.00192 ml 1.92 mL 19.2 ul Click Save and Submit to save and submit. Click Save All Answers to save all answers.
b) In this experiment an aspirin tablet mark with deionized water. Using a pipette into a 100-mL volumetric flask and diluted to t make a 'diluted aspirin solution'. an aspirin tablet was placed in a 250-ml volumetric flask o dissolved in 10 mL of 1.0M NaOH solution, the flask was then 1.0M NaOH solution, the flask was then filled to the nized water. Using a pipette, 5.0 mL of this solution was added mL volumetric flask and diluted to the...
4. A student calibrates a 25-mL pipette by measuring the volume of the water it can transfer. The reading data are shown as follows (unit in mL): 24.75, 24.83, 24.87, 24.91, and 25.32 (a) Is there an outlier at the 95% confidence level? (b) Calculate the coefficient of variation based on the results from part (a). (c) Suppose the standard deviation of the liquid volume is 0.04 mL, how many replicate measurements would the student need to get 95% confidence...
tically you can open Assignment 1 here 4. A student calibrates a 25-mL pipette by measuring the volume of the water it can transfer. The reading data are shown as follows (unit in mL): 24.75, 24.83, 24.87, 24.91, and 25.32 (a) Is there an outlier at the 95% confidence level? (b) Calculate the coefficient of variation based on the results from part (a) (c) Suppose the standard deviation of the liquid volume is 0.04 mL, how many replicate measurements would...
b) In this experiment an aspirin ta and dissolved in 10 mL of 1.0M Na mark with deionized water. Using a into a 100-mL volumetric flask and make a diluted aspirin solution'. ent an aspirin tablet was placed in a 250-ml volumetric flask 10 mL of 1.OM NaOH solution, the flask was then filled to the zed water. Using a pipette, 5.0 mL of this solution was added IL Volumetric flask and diluted to the mark with FeCl solution to...
Question 2 Calculate the two-sided 90% confidence interval for the population mean (mu) given that a sample of size n=13 yields a sample mean of 10.55 and a sample standard deviation of 0.95. Your answer: 10.45 <mu < 10.65 9.93 <mu < 11.17 10.03 <mu < 11.07 O 10.15<mu < 10.95 O 9.93 <mu < 11.17 9.68 <mu < 11.42 O 10.01 <mu < 11.09 10.03 <mu < 11.07 10.19 <mu < 10.91 O 10.08 < mu < 11.02 Clear...
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